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//==========================================================================
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//
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// src/sys/netinet6/icmp6.c
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//
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//==========================================================================
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//####BSDCOPYRIGHTBEGIN####
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//
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// -------------------------------------------
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//
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// Portions of this software may have been derived from OpenBSD,
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// FreeBSD or other sources, and are covered by the appropriate
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// copyright disclaimers included herein.
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//
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// Portions created by Red Hat are
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// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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//
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// -------------------------------------------
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//
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//####BSDCOPYRIGHTEND####
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//==========================================================================
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/* $KAME: icmp6.c,v 1.269 2001/12/18 02:19:16 jinmei 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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/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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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* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
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*/
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/domain.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#if defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#endif
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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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#include <netinet6/mld6_var.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <netinet/in_pcb.h>
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#include <netinet6/in6_pcb.h>
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#elif defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
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#include <netinet/in_pcb.h>
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#else
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#include <netinet6/in6_pcb.h>
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#endif
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#include <netinet6/nd6.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet6/ip6protosw.h>
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#ifdef __OpenBSD__ /* KAME IPSEC */
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#undef IPSEC
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#endif
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#include <netkey/key.h>
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#endif
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#ifdef MIP6
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#include <netinet6/mip6.h>
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#endif
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#ifdef HAVE_NRL_INPCB
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/* inpcb members */
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#define in6pcb inpcb
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#define in6p_laddr inp_laddr6
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#define in6p_faddr inp_faddr6
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#define in6p_icmp6filt inp_icmp6filt
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#define in6p_route inp_route
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#define in6p_socket inp_socket
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#define in6p_flags inp_flags
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#define in6p_moptions inp_moptions6
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#define in6p_outputopts inp_outputopts6
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#define in6p_ip6 inp_ipv6
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#define in6p_flowinfo inp_flowinfo
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#define in6p_sp inp_sp
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#define in6p_next inp_next
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#define in6p_prev inp_prev
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/*
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* for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
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* others...
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*/
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#define in6p_ip6_nxt inp_ipv6.ip6_nxt
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#endif
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extern struct domain inet6domain;
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extern struct ip6protosw inet6sw[];
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extern u_char ip6_protox[];
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struct icmp6stat icmp6stat;
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#if defined (__OpenBSD__)
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extern struct inpcbtable rawin6pcbtable;
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#elif !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
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extern struct in6pcb rawin6pcb;
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#else
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extern struct inpcbhead ripcb;
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#endif
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extern int icmp6errppslim;
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static int icmp6errpps_count = 0;
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static struct timeval icmp6errppslim_last;
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extern int icmp6_nodeinfo;
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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/*
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* List of callbacks to notify when Path MTU changes are made.
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*/
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struct icmp6_mtudisc_callback {
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LIST_ENTRY(icmp6_mtudisc_callback) mc_list;
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void (*mc_func) __P((struct in6_addr *));
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};
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LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks =
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LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks);
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static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL;
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extern int pmtu_expire;
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/* XXX do these values make any sense? */
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static int icmp6_mtudisc_hiwat = 1280;
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static int icmp6_mtudisc_lowat = 256;
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/*
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* keep track of # of redirect routes.
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*/
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static struct rttimer_queue *icmp6_redirect_timeout_q = NULL;
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/* XXX do these values make any sense? */
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static int icmp6_redirect_hiwat = 1280;
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static int icmp6_redirect_lowat = 1024;
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#endif
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static void icmp6_errcount __P((struct icmp6errstat *, int, int));
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static int icmp6_rip6_input __P((struct mbuf **, int));
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static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
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static const char *icmp6_redirect_diag __P((struct in6_addr *,
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struct in6_addr *, struct in6_addr *));
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#ifndef HAVE_PPSRATECHECK
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static int ppsratecheck __P((struct timeval *, int *, int));
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#endif
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static struct mbuf *ni6_input __P((struct mbuf *, int));
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static struct mbuf *ni6_nametodns __P((const char *, int, int));
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static int ni6_dnsmatch __P((const char *, int, const char *, int));
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static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
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struct ifnet **, char *));
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static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
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struct ifnet *, int));
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static int icmp6_notify_error __P((struct mbuf *, int, int, int));
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static int icmp6_recover_src __P((struct mbuf *));
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *));
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static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *));
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static void icmp6_redirect_timeout __P((struct rtentry *, struct rttimer *));
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#endif
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void
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icmp6_init()
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{
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mld6_init();
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire);
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icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout);
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#endif
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}
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static void
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icmp6_errcount(stat, type, code)
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struct icmp6errstat *stat;
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int type, code;
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{
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switch (type) {
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case ICMP6_DST_UNREACH:
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switch (code) {
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case ICMP6_DST_UNREACH_NOROUTE:
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stat->icp6errs_dst_unreach_noroute++;
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return;
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case ICMP6_DST_UNREACH_ADMIN:
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stat->icp6errs_dst_unreach_admin++;
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return;
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case ICMP6_DST_UNREACH_BEYONDSCOPE:
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stat->icp6errs_dst_unreach_beyondscope++;
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return;
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case ICMP6_DST_UNREACH_ADDR:
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stat->icp6errs_dst_unreach_addr++;
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return;
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case ICMP6_DST_UNREACH_NOPORT:
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stat->icp6errs_dst_unreach_noport++;
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return;
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}
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break;
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case ICMP6_PACKET_TOO_BIG:
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stat->icp6errs_packet_too_big++;
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return;
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case ICMP6_TIME_EXCEEDED:
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switch (code) {
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case ICMP6_TIME_EXCEED_TRANSIT:
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stat->icp6errs_time_exceed_transit++;
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return;
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case ICMP6_TIME_EXCEED_REASSEMBLY:
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stat->icp6errs_time_exceed_reassembly++;
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return;
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}
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break;
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case ICMP6_PARAM_PROB:
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switch (code) {
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case ICMP6_PARAMPROB_HEADER:
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stat->icp6errs_paramprob_header++;
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return;
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282 |
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case ICMP6_PARAMPROB_NEXTHEADER:
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283 |
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stat->icp6errs_paramprob_nextheader++;
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284 |
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return;
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285 |
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case ICMP6_PARAMPROB_OPTION:
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286 |
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stat->icp6errs_paramprob_option++;
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287 |
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return;
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288 |
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}
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289 |
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break;
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290 |
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case ND_REDIRECT:
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291 |
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stat->icp6errs_redirect++;
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292 |
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return;
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293 |
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}
|
294 |
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stat->icp6errs_unknown++;
|
295 |
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}
|
296 |
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297 |
|
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#if defined(__NetBSD__) || defined(__OpenBSD__)
|
298 |
|
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/*
|
299 |
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* Register a Path MTU Discovery callback.
|
300 |
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*/
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301 |
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void
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302 |
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icmp6_mtudisc_callback_register(func)
|
303 |
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void (*func) __P((struct in6_addr *));
|
304 |
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{
|
305 |
|
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struct icmp6_mtudisc_callback *mc;
|
306 |
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|
307 |
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for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
|
308 |
|
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mc = LIST_NEXT(mc, mc_list)) {
|
309 |
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if (mc->mc_func == func)
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310 |
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return;
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311 |
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}
|
312 |
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313 |
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mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT);
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314 |
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if (mc == NULL)
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315 |
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panic("icmp6_mtudisc_callback_register");
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316 |
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317 |
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mc->mc_func = func;
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318 |
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LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list);
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319 |
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}
|
320 |
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#endif
|
321 |
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|
322 |
|
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/*
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323 |
|
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* Generate an error packet of type error in response to bad IP6 packet.
|
324 |
|
|
*/
|
325 |
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void
|
326 |
|
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icmp6_error(m, type, code, param)
|
327 |
|
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struct mbuf *m;
|
328 |
|
|
int type, code, param;
|
329 |
|
|
{
|
330 |
|
|
struct ip6_hdr *oip6, *nip6;
|
331 |
|
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struct icmp6_hdr *icmp6;
|
332 |
|
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struct mbuf *n;
|
333 |
|
|
struct ip6aux *ip6a;
|
334 |
|
|
struct in6_addr nip6_src, *nip6_srcp;
|
335 |
|
|
u_int preplen;
|
336 |
|
|
int off;
|
337 |
|
|
int nxt;
|
338 |
|
|
|
339 |
|
|
icmp6stat.icp6s_error++;
|
340 |
|
|
|
341 |
|
|
/* count per-type-code statistics */
|
342 |
|
|
icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
|
343 |
|
|
|
344 |
|
|
#ifdef M_DECRYPTED /* not openbsd */
|
345 |
|
|
if (m->m_flags & M_DECRYPTED) {
|
346 |
|
|
icmp6stat.icp6s_canterror++;
|
347 |
|
|
goto freeit;
|
348 |
|
|
}
|
349 |
|
|
#endif
|
350 |
|
|
|
351 |
|
|
#ifndef PULLDOWN_TEST
|
352 |
|
|
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
|
353 |
|
|
#else
|
354 |
|
|
if (m->m_len < sizeof(struct ip6_hdr)) {
|
355 |
|
|
m = m_pullup(m, sizeof(struct ip6_hdr));
|
356 |
|
|
if (m == NULL)
|
357 |
|
|
return;
|
358 |
|
|
}
|
359 |
|
|
#endif
|
360 |
|
|
oip6 = mtod(m, struct ip6_hdr *);
|
361 |
|
|
|
362 |
|
|
/*
|
363 |
|
|
* If the destination address of the erroneous packet is a multicast
|
364 |
|
|
* address, or the packet was sent using link-layer multicast,
|
365 |
|
|
* we should basically suppress sending an error (RFC 2463, Section
|
366 |
|
|
* 2.4).
|
367 |
|
|
* We have two exceptions (the item e.2 in that section):
|
368 |
|
|
* - the Pakcet Too Big message can be sent for path MTU discovery.
|
369 |
|
|
* - the Parameter Problem Message that can be allowed an icmp6 error
|
370 |
|
|
* in the option type field. This check has been done in
|
371 |
|
|
* ip6_unknown_opt(), so we can just check the type and code.
|
372 |
|
|
*/
|
373 |
|
|
if ((m->m_flags & (M_BCAST|M_MCAST) ||
|
374 |
|
|
IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
|
375 |
|
|
(type != ICMP6_PACKET_TOO_BIG &&
|
376 |
|
|
(type != ICMP6_PARAM_PROB ||
|
377 |
|
|
code != ICMP6_PARAMPROB_OPTION)))
|
378 |
|
|
goto freeit;
|
379 |
|
|
|
380 |
|
|
/*
|
381 |
|
|
* RFC 2463, 2.4 (e.5): source address check.
|
382 |
|
|
* XXX: the case of anycast source?
|
383 |
|
|
*/
|
384 |
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
|
385 |
|
|
IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
|
386 |
|
|
goto freeit;
|
387 |
|
|
|
388 |
|
|
/*
|
389 |
|
|
* If we are about to send ICMPv6 against ICMPv6 error/redirect,
|
390 |
|
|
* don't do it.
|
391 |
|
|
*/
|
392 |
|
|
nxt = -1;
|
393 |
|
|
off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
|
394 |
|
|
if (off >= 0 && nxt == IPPROTO_ICMPV6) {
|
395 |
|
|
struct icmp6_hdr *icp;
|
396 |
|
|
|
397 |
|
|
#ifndef PULLDOWN_TEST
|
398 |
|
|
IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
|
399 |
|
|
icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
|
400 |
|
|
#else
|
401 |
|
|
IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
|
402 |
|
|
sizeof(*icp));
|
403 |
|
|
if (icp == NULL) {
|
404 |
|
|
icmp6stat.icp6s_tooshort++;
|
405 |
|
|
return;
|
406 |
|
|
}
|
407 |
|
|
#endif
|
408 |
|
|
if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
|
409 |
|
|
icp->icmp6_type == ND_REDIRECT) {
|
410 |
|
|
/*
|
411 |
|
|
* ICMPv6 error
|
412 |
|
|
* Special case: for redirect (which is
|
413 |
|
|
* informational) we must not send icmp6 error.
|
414 |
|
|
*/
|
415 |
|
|
icmp6stat.icp6s_canterror++;
|
416 |
|
|
goto freeit;
|
417 |
|
|
} else {
|
418 |
|
|
/* ICMPv6 informational - send the error */
|
419 |
|
|
}
|
420 |
|
|
}
|
421 |
|
|
#if 0 /* controversial */
|
422 |
|
|
else if (off >= 0 && nxt == IPPROTO_ESP) {
|
423 |
|
|
/*
|
424 |
|
|
* It could be ICMPv6 error inside ESP. Take a safer side,
|
425 |
|
|
* don't respond.
|
426 |
|
|
*/
|
427 |
|
|
icmp6stat.icp6s_canterror++;
|
428 |
|
|
goto freeit;
|
429 |
|
|
}
|
430 |
|
|
#endif
|
431 |
|
|
else {
|
432 |
|
|
/* non-ICMPv6 - send the error */
|
433 |
|
|
}
|
434 |
|
|
|
435 |
|
|
oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
|
436 |
|
|
|
437 |
|
|
/* Finally, do rate limitation check. */
|
438 |
|
|
if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
|
439 |
|
|
icmp6stat.icp6s_toofreq++;
|
440 |
|
|
goto freeit;
|
441 |
|
|
}
|
442 |
|
|
|
443 |
|
|
/*
|
444 |
|
|
* OK, ICMP6 can be generated.
|
445 |
|
|
*/
|
446 |
|
|
|
447 |
|
|
/*
|
448 |
|
|
* Recover the original ip6_src if the src and the homeaddr
|
449 |
|
|
* have been swapped while dest6 processing (see dest6.c). To
|
450 |
|
|
* avoid m_pulldown, we had better to swap addresses before
|
451 |
|
|
* m_prepend below.
|
452 |
|
|
*
|
453 |
|
|
* XXX: We should consider the other candidate to keep the
|
454 |
|
|
* icmp6 error packet correct that not swapping ip6_src and
|
455 |
|
|
* homeaddr in the dest6 processing.
|
456 |
|
|
*/
|
457 |
|
|
nip6_srcp = &oip6->ip6_src;
|
458 |
|
|
n = ip6_findaux(m);
|
459 |
|
|
if (n != NULL) {
|
460 |
|
|
ip6a = mtod(n, struct ip6aux *);
|
461 |
|
|
if ((ip6a->ip6a_flags & IP6A_HASEEN) != 0 &&
|
462 |
|
|
(ip6a->ip6a_flags & IP6A_SWAP) != 0) {
|
463 |
|
|
nip6_src = oip6->ip6_src;
|
464 |
|
|
nip6_srcp = &nip6_src;
|
465 |
|
|
if (icmp6_recover_src(m)) {
|
466 |
|
|
/* mbuf is freed in icmp6_recover_src */
|
467 |
|
|
return;
|
468 |
|
|
}
|
469 |
|
|
oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
|
470 |
|
|
}
|
471 |
|
|
}
|
472 |
|
|
|
473 |
|
|
if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
|
474 |
|
|
m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
|
475 |
|
|
|
476 |
|
|
preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
477 |
|
|
M_PREPEND(m, preplen, M_DONTWAIT);
|
478 |
|
|
if (m && m->m_len < preplen)
|
479 |
|
|
m = m_pullup(m, preplen);
|
480 |
|
|
if (m == NULL) {
|
481 |
|
|
nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
|
482 |
|
|
return;
|
483 |
|
|
}
|
484 |
|
|
|
485 |
|
|
nip6 = mtod(m, struct ip6_hdr *);
|
486 |
|
|
nip6->ip6_src = *nip6_srcp;
|
487 |
|
|
nip6->ip6_dst = oip6->ip6_dst;
|
488 |
|
|
|
489 |
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
|
490 |
|
|
oip6->ip6_src.s6_addr16[1] = 0;
|
491 |
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
|
492 |
|
|
oip6->ip6_dst.s6_addr16[1] = 0;
|
493 |
|
|
|
494 |
|
|
icmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
495 |
|
|
icmp6->icmp6_type = type;
|
496 |
|
|
icmp6->icmp6_code = code;
|
497 |
|
|
icmp6->icmp6_pptr = htonl((u_int32_t)param);
|
498 |
|
|
|
499 |
|
|
/*
|
500 |
|
|
* icmp6_reflect() is designed to be in the input path.
|
501 |
|
|
* icmp6_error() can be called from both input and outut path,
|
502 |
|
|
* and if we are in output path rcvif could contain bogus value.
|
503 |
|
|
* clear m->m_pkthdr.rcvif for safety, we should have enough scope
|
504 |
|
|
* information in ip header (nip6).
|
505 |
|
|
*/
|
506 |
|
|
m->m_pkthdr.rcvif = NULL;
|
507 |
|
|
|
508 |
|
|
icmp6stat.icp6s_outhist[type]++;
|
509 |
|
|
icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
|
510 |
|
|
|
511 |
|
|
return;
|
512 |
|
|
|
513 |
|
|
freeit:
|
514 |
|
|
/*
|
515 |
|
|
* If we can't tell wheter or not we can generate ICMP6, free it.
|
516 |
|
|
*/
|
517 |
|
|
m_freem(m);
|
518 |
|
|
}
|
519 |
|
|
|
520 |
|
|
/*
|
521 |
|
|
* Process a received ICMP6 message.
|
522 |
|
|
*/
|
523 |
|
|
int
|
524 |
|
|
icmp6_input(mp, offp, proto)
|
525 |
|
|
struct mbuf **mp;
|
526 |
|
|
int *offp, proto;
|
527 |
|
|
{
|
528 |
|
|
struct mbuf *m = *mp, *n;
|
529 |
|
|
struct ip6_hdr *ip6, *nip6;
|
530 |
|
|
struct icmp6_hdr *icmp6, *nicmp6;
|
531 |
|
|
int off = *offp;
|
532 |
|
|
int icmp6len = m->m_pkthdr.len - *offp;
|
533 |
|
|
int code, sum, noff;
|
534 |
|
|
|
535 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
|
536 |
|
|
|
537 |
|
|
#ifndef PULLDOWN_TEST
|
538 |
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
|
539 |
|
|
/* m might change if M_LOOP. So, call mtod after this */
|
540 |
|
|
#endif
|
541 |
|
|
|
542 |
|
|
/*
|
543 |
|
|
* Locate icmp6 structure in mbuf, and check
|
544 |
|
|
* that not corrupted and of at least minimum length
|
545 |
|
|
*/
|
546 |
|
|
|
547 |
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
548 |
|
|
if (icmp6len < sizeof(struct icmp6_hdr)) {
|
549 |
|
|
icmp6stat.icp6s_tooshort++;
|
550 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
551 |
|
|
goto freeit;
|
552 |
|
|
}
|
553 |
|
|
|
554 |
|
|
/*
|
555 |
|
|
* calculate the checksum
|
556 |
|
|
*/
|
557 |
|
|
#ifndef PULLDOWN_TEST
|
558 |
|
|
icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
|
559 |
|
|
#else
|
560 |
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
|
561 |
|
|
if (icmp6 == NULL) {
|
562 |
|
|
icmp6stat.icp6s_tooshort++;
|
563 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
564 |
|
|
return IPPROTO_DONE;
|
565 |
|
|
}
|
566 |
|
|
#endif
|
567 |
|
|
code = icmp6->icmp6_code;
|
568 |
|
|
|
569 |
|
|
if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
|
570 |
|
|
nd6log((LOG_ERR,
|
571 |
|
|
"ICMP6 checksum error(%d|%x) %s\n",
|
572 |
|
|
icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
|
573 |
|
|
icmp6stat.icp6s_checksum++;
|
574 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
575 |
|
|
goto freeit;
|
576 |
|
|
}
|
577 |
|
|
|
578 |
|
|
#if defined(NFAITH) && 0 < NFAITH
|
579 |
|
|
if (faithprefix(&ip6->ip6_dst)) {
|
580 |
|
|
/*
|
581 |
|
|
* Deliver very specific ICMP6 type only.
|
582 |
|
|
* This is important to deilver TOOBIG. Otherwise PMTUD
|
583 |
|
|
* will not work.
|
584 |
|
|
*/
|
585 |
|
|
switch (icmp6->icmp6_type) {
|
586 |
|
|
case ICMP6_DST_UNREACH:
|
587 |
|
|
case ICMP6_PACKET_TOO_BIG:
|
588 |
|
|
case ICMP6_TIME_EXCEEDED:
|
589 |
|
|
break;
|
590 |
|
|
default:
|
591 |
|
|
goto freeit;
|
592 |
|
|
}
|
593 |
|
|
}
|
594 |
|
|
#endif
|
595 |
|
|
|
596 |
|
|
icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
|
597 |
|
|
|
598 |
|
|
#ifdef MIP6
|
599 |
|
|
if (mip6_icmp6_tunnel_input(m, off, icmp6len)) {
|
600 |
|
|
goto freeit;
|
601 |
|
|
}
|
602 |
|
|
#endif /* MIP6 */
|
603 |
|
|
switch (icmp6->icmp6_type) {
|
604 |
|
|
case ICMP6_DST_UNREACH:
|
605 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
|
606 |
|
|
#ifdef MIP6
|
607 |
|
|
if (mip6_icmp6_input(m, off, icmp6len))
|
608 |
|
|
goto freeit;
|
609 |
|
|
#endif /* MIP6 */
|
610 |
|
|
switch (code) {
|
611 |
|
|
case ICMP6_DST_UNREACH_NOROUTE:
|
612 |
|
|
code = PRC_UNREACH_NET;
|
613 |
|
|
break;
|
614 |
|
|
case ICMP6_DST_UNREACH_ADMIN:
|
615 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
|
616 |
|
|
code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
|
617 |
|
|
break;
|
618 |
|
|
case ICMP6_DST_UNREACH_ADDR:
|
619 |
|
|
code = PRC_HOSTDEAD;
|
620 |
|
|
break;
|
621 |
|
|
#ifdef COMPAT_RFC1885
|
622 |
|
|
case ICMP6_DST_UNREACH_NOTNEIGHBOR:
|
623 |
|
|
code = PRC_UNREACH_SRCFAIL;
|
624 |
|
|
break;
|
625 |
|
|
#else
|
626 |
|
|
case ICMP6_DST_UNREACH_BEYONDSCOPE:
|
627 |
|
|
/* I mean "source address was incorrect." */
|
628 |
|
|
code = PRC_UNREACH_NET;
|
629 |
|
|
break;
|
630 |
|
|
#endif
|
631 |
|
|
case ICMP6_DST_UNREACH_NOPORT:
|
632 |
|
|
code = PRC_UNREACH_PORT;
|
633 |
|
|
break;
|
634 |
|
|
default:
|
635 |
|
|
goto badcode;
|
636 |
|
|
}
|
637 |
|
|
goto deliver;
|
638 |
|
|
break;
|
639 |
|
|
|
640 |
|
|
case ICMP6_PACKET_TOO_BIG:
|
641 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
|
642 |
|
|
if (code != 0)
|
643 |
|
|
goto badcode;
|
644 |
|
|
|
645 |
|
|
code = PRC_MSGSIZE;
|
646 |
|
|
|
647 |
|
|
/*
|
648 |
|
|
* Updating the path MTU will be done after examining
|
649 |
|
|
* intermediate extension headers.
|
650 |
|
|
*/
|
651 |
|
|
goto deliver;
|
652 |
|
|
break;
|
653 |
|
|
|
654 |
|
|
case ICMP6_TIME_EXCEEDED:
|
655 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
|
656 |
|
|
switch (code) {
|
657 |
|
|
case ICMP6_TIME_EXCEED_TRANSIT:
|
658 |
|
|
code = PRC_TIMXCEED_INTRANS;
|
659 |
|
|
break;
|
660 |
|
|
case ICMP6_TIME_EXCEED_REASSEMBLY:
|
661 |
|
|
code = PRC_TIMXCEED_REASS;
|
662 |
|
|
break;
|
663 |
|
|
default:
|
664 |
|
|
goto badcode;
|
665 |
|
|
}
|
666 |
|
|
goto deliver;
|
667 |
|
|
break;
|
668 |
|
|
|
669 |
|
|
case ICMP6_PARAM_PROB:
|
670 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
|
671 |
|
|
switch (code) {
|
672 |
|
|
case ICMP6_PARAMPROB_NEXTHEADER:
|
673 |
|
|
code = PRC_UNREACH_PROTOCOL;
|
674 |
|
|
break;
|
675 |
|
|
case ICMP6_PARAMPROB_HEADER:
|
676 |
|
|
case ICMP6_PARAMPROB_OPTION:
|
677 |
|
|
#ifdef MIP6
|
678 |
|
|
if (mip6_icmp6_input(m, off, icmp6len))
|
679 |
|
|
goto freeit;
|
680 |
|
|
#endif /* MIP6 */
|
681 |
|
|
code = PRC_PARAMPROB;
|
682 |
|
|
break;
|
683 |
|
|
default:
|
684 |
|
|
goto badcode;
|
685 |
|
|
}
|
686 |
|
|
goto deliver;
|
687 |
|
|
break;
|
688 |
|
|
|
689 |
|
|
case ICMP6_ECHO_REQUEST:
|
690 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
|
691 |
|
|
if (code != 0)
|
692 |
|
|
goto badcode;
|
693 |
|
|
/*
|
694 |
|
|
* Copy mbuf to send to two data paths: userland socket(s),
|
695 |
|
|
* and to the querier (echo reply).
|
696 |
|
|
* m: a copy for socket, n: a copy for querier
|
697 |
|
|
*/
|
698 |
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
699 |
|
|
/* Give up local */
|
700 |
|
|
n = m;
|
701 |
|
|
m = NULL;
|
702 |
|
|
goto deliverecho;
|
703 |
|
|
}
|
704 |
|
|
/*
|
705 |
|
|
* If the first mbuf is shared, or the first mbuf is too short,
|
706 |
|
|
* copy the first part of the data into a fresh mbuf.
|
707 |
|
|
* Otherwise, we will wrongly overwrite both copies.
|
708 |
|
|
*/
|
709 |
|
|
if ((n->m_flags & M_EXT) != 0 ||
|
710 |
|
|
n->m_len < off + sizeof(struct icmp6_hdr)) {
|
711 |
|
|
struct mbuf *n0 = n;
|
712 |
|
|
const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
|
713 |
|
|
|
714 |
|
|
/*
|
715 |
|
|
* Prepare an internal mbuf. m_pullup() doesn't
|
716 |
|
|
* always copy the length we specified.
|
717 |
|
|
*/
|
718 |
|
|
if (maxlen >= MCLBYTES) {
|
719 |
|
|
/* Give up remote */
|
720 |
|
|
m_freem(n0);
|
721 |
|
|
break;
|
722 |
|
|
}
|
723 |
|
|
MGETHDR(n, M_DONTWAIT, n0->m_type);
|
724 |
|
|
if (n && maxlen >= MHLEN) {
|
725 |
|
|
MCLGET(n, M_DONTWAIT);
|
726 |
|
|
if ((n->m_flags & M_EXT) == 0) {
|
727 |
|
|
m_free(n);
|
728 |
|
|
n = NULL;
|
729 |
|
|
}
|
730 |
|
|
}
|
731 |
|
|
if (n == NULL) {
|
732 |
|
|
/* Give up local */
|
733 |
|
|
m_freem(n0);
|
734 |
|
|
n = m;
|
735 |
|
|
m = NULL;
|
736 |
|
|
goto deliverecho;
|
737 |
|
|
}
|
738 |
|
|
#ifdef __OpenBSD__
|
739 |
|
|
M_MOVE_PKTHDR(n, n0);
|
740 |
|
|
#else
|
741 |
|
|
M_COPY_PKTHDR(n, n0);
|
742 |
|
|
#endif
|
743 |
|
|
/*
|
744 |
|
|
* Copy IPv6 and ICMPv6 only.
|
745 |
|
|
*/
|
746 |
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
747 |
|
|
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
|
748 |
|
|
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
749 |
|
|
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
|
750 |
|
|
noff = sizeof(struct ip6_hdr);
|
751 |
|
|
n->m_len = noff + sizeof(struct icmp6_hdr);
|
752 |
|
|
/*
|
753 |
|
|
* Adjust mbuf. ip6_plen will be adjusted in
|
754 |
|
|
* ip6_output().
|
755 |
|
|
* n->m_pkthdr.len == n0->m_pkthdr.len at this point.
|
756 |
|
|
*/
|
757 |
|
|
n->m_pkthdr.len += noff + sizeof(struct icmp6_hdr);
|
758 |
|
|
n->m_pkthdr.len -= (off + sizeof(struct icmp6_hdr));
|
759 |
|
|
m_adj(n0, off + sizeof(struct icmp6_hdr));
|
760 |
|
|
n->m_next = n0;
|
761 |
|
|
n0->m_flags &= ~M_PKTHDR;
|
762 |
|
|
} else {
|
763 |
|
|
deliverecho:
|
764 |
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
765 |
|
|
nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
|
766 |
|
|
noff = off;
|
767 |
|
|
}
|
768 |
|
|
nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
|
769 |
|
|
nicmp6->icmp6_code = 0;
|
770 |
|
|
if (n) {
|
771 |
|
|
icmp6stat.icp6s_reflect++;
|
772 |
|
|
icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
|
773 |
|
|
icmp6_reflect(n, noff);
|
774 |
|
|
}
|
775 |
|
|
if (!m)
|
776 |
|
|
goto freeit;
|
777 |
|
|
break;
|
778 |
|
|
|
779 |
|
|
case ICMP6_ECHO_REPLY:
|
780 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
|
781 |
|
|
if (code != 0)
|
782 |
|
|
goto badcode;
|
783 |
|
|
break;
|
784 |
|
|
|
785 |
|
|
#ifdef MIP6
|
786 |
|
|
case ICMP6_HADISCOV_REQUEST:
|
787 |
|
|
if (icmp6len < sizeof(struct ha_discov_req))
|
788 |
|
|
goto badlen;
|
789 |
|
|
if (code != 0)
|
790 |
|
|
goto badcode;
|
791 |
|
|
if (mip6_icmp6_input(m, off, icmp6len))
|
792 |
|
|
goto freeit;
|
793 |
|
|
break;
|
794 |
|
|
case ICMP6_HADISCOV_REPLY:
|
795 |
|
|
if (icmp6len < sizeof(struct ha_discov_rep))
|
796 |
|
|
goto badlen;
|
797 |
|
|
if (code != 0)
|
798 |
|
|
goto badcode;
|
799 |
|
|
if (mip6_icmp6_input(m, off, icmp6len))
|
800 |
|
|
goto freeit;
|
801 |
|
|
break;
|
802 |
|
|
#ifndef MIP6_DRAFT13
|
803 |
|
|
case ICMP6_MOBILEPREFIX_SOLICIT:
|
804 |
|
|
if (icmp6len < sizeof(struct mobile_prefix_solicit))
|
805 |
|
|
goto badlen;
|
806 |
|
|
if (code != 0)
|
807 |
|
|
goto badcode;
|
808 |
|
|
if (mip6_icmp6_input(m, off, icmp6len))
|
809 |
|
|
goto freeit;
|
810 |
|
|
break;
|
811 |
|
|
|
812 |
|
|
case ICMP6_MOBILEPREFIX_ADVERT:
|
813 |
|
|
if (icmp6len < sizeof (struct mobile_prefix_advert))
|
814 |
|
|
goto badlen;
|
815 |
|
|
if (code != 0)
|
816 |
|
|
goto badcode;
|
817 |
|
|
if (mip6_icmp6_input(m, off, icmp6len))
|
818 |
|
|
goto freeit;
|
819 |
|
|
break;
|
820 |
|
|
#endif /* !MIP6_DRAFT13 */
|
821 |
|
|
#endif /* MIP6 */
|
822 |
|
|
|
823 |
|
|
case MLD_LISTENER_QUERY:
|
824 |
|
|
case MLD_LISTENER_REPORT:
|
825 |
|
|
if (icmp6len < sizeof(struct mld_hdr))
|
826 |
|
|
goto badlen;
|
827 |
|
|
if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
|
828 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
|
829 |
|
|
else
|
830 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
|
831 |
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
832 |
|
|
/* give up local */
|
833 |
|
|
mld6_input(m, off);
|
834 |
|
|
m = NULL;
|
835 |
|
|
goto freeit;
|
836 |
|
|
}
|
837 |
|
|
mld6_input(n, off);
|
838 |
|
|
/* m stays. */
|
839 |
|
|
break;
|
840 |
|
|
|
841 |
|
|
case MLD_LISTENER_DONE:
|
842 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
|
843 |
|
|
if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
|
844 |
|
|
goto badlen;
|
845 |
|
|
break; /* nothing to be done in kernel */
|
846 |
|
|
|
847 |
|
|
case MLD_MTRACE_RESP:
|
848 |
|
|
case MLD_MTRACE:
|
849 |
|
|
/* XXX: these two are experimental. not officially defined. */
|
850 |
|
|
/* XXX: per-interface statistics? */
|
851 |
|
|
break; /* just pass it to applications */
|
852 |
|
|
|
853 |
|
|
case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
|
854 |
|
|
{
|
855 |
|
|
enum { WRU, FQDN } mode;
|
856 |
|
|
|
857 |
|
|
if (!icmp6_nodeinfo)
|
858 |
|
|
break;
|
859 |
|
|
|
860 |
|
|
if (icmp6len == sizeof(struct icmp6_hdr) + 4)
|
861 |
|
|
mode = WRU;
|
862 |
|
|
else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
|
863 |
|
|
mode = FQDN;
|
864 |
|
|
else
|
865 |
|
|
goto badlen;
|
866 |
|
|
|
867 |
|
|
#ifdef __FreeBSD__
|
868 |
|
|
#define hostnamelen strlen(hostname)
|
869 |
|
|
#endif
|
870 |
|
|
if (mode == FQDN) {
|
871 |
|
|
#ifndef PULLDOWN_TEST
|
872 |
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
|
873 |
|
|
IPPROTO_DONE);
|
874 |
|
|
#endif
|
875 |
|
|
n = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
|
876 |
|
|
if (n)
|
877 |
|
|
n = ni6_input(n, off);
|
878 |
|
|
/* XXX meaningless if n == NULL */
|
879 |
|
|
noff = sizeof(struct ip6_hdr);
|
880 |
|
|
} else {
|
881 |
|
|
u_char *p;
|
882 |
|
|
int maxlen, maxhlen;
|
883 |
|
|
|
884 |
|
|
if ((icmp6_nodeinfo & 5) != 5)
|
885 |
|
|
break;
|
886 |
|
|
|
887 |
|
|
if (code != 0)
|
888 |
|
|
goto badcode;
|
889 |
|
|
maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
|
890 |
|
|
if (maxlen >= MCLBYTES) {
|
891 |
|
|
/* Give up remote */
|
892 |
|
|
break;
|
893 |
|
|
}
|
894 |
|
|
MGETHDR(n, M_DONTWAIT, m->m_type);
|
895 |
|
|
if (n && maxlen > MHLEN) {
|
896 |
|
|
MCLGET(n, M_DONTWAIT);
|
897 |
|
|
if ((n->m_flags & M_EXT) == 0) {
|
898 |
|
|
m_free(n);
|
899 |
|
|
n = NULL;
|
900 |
|
|
}
|
901 |
|
|
}
|
902 |
|
|
if (n == NULL) {
|
903 |
|
|
/* Give up remote */
|
904 |
|
|
break;
|
905 |
|
|
}
|
906 |
|
|
n->m_pkthdr.rcvif = NULL;
|
907 |
|
|
n->m_len = 0;
|
908 |
|
|
maxhlen = M_TRAILINGSPACE(n) - maxlen;
|
909 |
|
|
if (maxhlen > hostnamelen)
|
910 |
|
|
maxhlen = hostnamelen;
|
911 |
|
|
/*
|
912 |
|
|
* Copy IPv6 and ICMPv6 only.
|
913 |
|
|
*/
|
914 |
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
915 |
|
|
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
|
916 |
|
|
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
917 |
|
|
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
|
918 |
|
|
p = (u_char *)(nicmp6 + 1);
|
919 |
|
|
bzero(p, 4);
|
920 |
|
|
bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
|
921 |
|
|
noff = sizeof(struct ip6_hdr);
|
922 |
|
|
#ifdef __OpenBSD__
|
923 |
|
|
M_DUP_PKTHDR(n, m); /* just for rcvif */
|
924 |
|
|
#else
|
925 |
|
|
M_COPY_PKTHDR(n, m); /* just for rcvif */
|
926 |
|
|
#endif
|
927 |
|
|
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
|
928 |
|
|
sizeof(struct icmp6_hdr) + 4 + maxhlen;
|
929 |
|
|
nicmp6->icmp6_type = ICMP6_WRUREPLY;
|
930 |
|
|
nicmp6->icmp6_code = 0;
|
931 |
|
|
}
|
932 |
|
|
#undef hostnamelen
|
933 |
|
|
if (n) {
|
934 |
|
|
icmp6stat.icp6s_reflect++;
|
935 |
|
|
icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
|
936 |
|
|
icmp6_reflect(n, noff);
|
937 |
|
|
}
|
938 |
|
|
break;
|
939 |
|
|
}
|
940 |
|
|
|
941 |
|
|
case ICMP6_WRUREPLY:
|
942 |
|
|
if (code != 0)
|
943 |
|
|
goto badcode;
|
944 |
|
|
break;
|
945 |
|
|
|
946 |
|
|
case ND_ROUTER_SOLICIT:
|
947 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
|
948 |
|
|
if (code != 0)
|
949 |
|
|
goto badcode;
|
950 |
|
|
if (icmp6len < sizeof(struct nd_router_solicit))
|
951 |
|
|
goto badlen;
|
952 |
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
953 |
|
|
/* give up local */
|
954 |
|
|
nd6_rs_input(m, off, icmp6len);
|
955 |
|
|
m = NULL;
|
956 |
|
|
goto freeit;
|
957 |
|
|
}
|
958 |
|
|
nd6_rs_input(n, off, icmp6len);
|
959 |
|
|
/* m stays. */
|
960 |
|
|
break;
|
961 |
|
|
|
962 |
|
|
case ND_ROUTER_ADVERT:
|
963 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
|
964 |
|
|
if (code != 0)
|
965 |
|
|
goto badcode;
|
966 |
|
|
if (icmp6len < sizeof(struct nd_router_advert))
|
967 |
|
|
goto badlen;
|
968 |
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
969 |
|
|
/* give up local */
|
970 |
|
|
nd6_ra_input(m, off, icmp6len);
|
971 |
|
|
m = NULL;
|
972 |
|
|
goto freeit;
|
973 |
|
|
}
|
974 |
|
|
nd6_ra_input(n, off, icmp6len);
|
975 |
|
|
/* m stays. */
|
976 |
|
|
break;
|
977 |
|
|
|
978 |
|
|
case ND_NEIGHBOR_SOLICIT:
|
979 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
|
980 |
|
|
if (code != 0)
|
981 |
|
|
goto badcode;
|
982 |
|
|
if (icmp6len < sizeof(struct nd_neighbor_solicit))
|
983 |
|
|
goto badlen;
|
984 |
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
985 |
|
|
/* give up local */
|
986 |
|
|
nd6_ns_input(m, off, icmp6len);
|
987 |
|
|
m = NULL;
|
988 |
|
|
goto freeit;
|
989 |
|
|
}
|
990 |
|
|
nd6_ns_input(n, off, icmp6len);
|
991 |
|
|
/* m stays. */
|
992 |
|
|
break;
|
993 |
|
|
|
994 |
|
|
case ND_NEIGHBOR_ADVERT:
|
995 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
|
996 |
|
|
if (code != 0)
|
997 |
|
|
goto badcode;
|
998 |
|
|
if (icmp6len < sizeof(struct nd_neighbor_advert))
|
999 |
|
|
goto badlen;
|
1000 |
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
1001 |
|
|
/* give up local */
|
1002 |
|
|
nd6_na_input(m, off, icmp6len);
|
1003 |
|
|
m = NULL;
|
1004 |
|
|
goto freeit;
|
1005 |
|
|
}
|
1006 |
|
|
nd6_na_input(n, off, icmp6len);
|
1007 |
|
|
/* m stays. */
|
1008 |
|
|
break;
|
1009 |
|
|
|
1010 |
|
|
case ND_REDIRECT:
|
1011 |
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
|
1012 |
|
|
if (code != 0)
|
1013 |
|
|
goto badcode;
|
1014 |
|
|
if (icmp6len < sizeof(struct nd_redirect))
|
1015 |
|
|
goto badlen;
|
1016 |
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
1017 |
|
|
/* give up local */
|
1018 |
|
|
icmp6_redirect_input(m, off);
|
1019 |
|
|
m = NULL;
|
1020 |
|
|
goto freeit;
|
1021 |
|
|
}
|
1022 |
|
|
icmp6_redirect_input(n, off);
|
1023 |
|
|
/* m stays. */
|
1024 |
|
|
break;
|
1025 |
|
|
|
1026 |
|
|
case ICMP6_ROUTER_RENUMBERING:
|
1027 |
|
|
if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
|
1028 |
|
|
code != ICMP6_ROUTER_RENUMBERING_RESULT)
|
1029 |
|
|
goto badcode;
|
1030 |
|
|
if (icmp6len < sizeof(struct icmp6_router_renum))
|
1031 |
|
|
goto badlen;
|
1032 |
|
|
break;
|
1033 |
|
|
|
1034 |
|
|
default:
|
1035 |
|
|
nd6log((LOG_DEBUG,
|
1036 |
|
|
"icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
|
1037 |
|
|
icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
|
1038 |
|
|
ip6_sprintf(&ip6->ip6_dst),
|
1039 |
|
|
m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
|
1040 |
|
|
if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
|
1041 |
|
|
/* ICMPv6 error: MUST deliver it by spec... */
|
1042 |
|
|
code = PRC_NCMDS;
|
1043 |
|
|
/* deliver */
|
1044 |
|
|
} else {
|
1045 |
|
|
/* ICMPv6 informational: MUST not deliver */
|
1046 |
|
|
break;
|
1047 |
|
|
}
|
1048 |
|
|
deliver:
|
1049 |
|
|
if (icmp6_notify_error(m, off, icmp6len, code)) {
|
1050 |
|
|
/* In this case, m should've been freed. */
|
1051 |
|
|
return(IPPROTO_DONE);
|
1052 |
|
|
}
|
1053 |
|
|
break;
|
1054 |
|
|
|
1055 |
|
|
badcode:
|
1056 |
|
|
icmp6stat.icp6s_badcode++;
|
1057 |
|
|
break;
|
1058 |
|
|
|
1059 |
|
|
badlen:
|
1060 |
|
|
icmp6stat.icp6s_badlen++;
|
1061 |
|
|
break;
|
1062 |
|
|
}
|
1063 |
|
|
|
1064 |
|
|
/* deliver the packet to appropriate sockets */
|
1065 |
|
|
icmp6_rip6_input(&m, *offp);
|
1066 |
|
|
|
1067 |
|
|
return IPPROTO_DONE;
|
1068 |
|
|
|
1069 |
|
|
freeit:
|
1070 |
|
|
m_freem(m);
|
1071 |
|
|
return IPPROTO_DONE;
|
1072 |
|
|
}
|
1073 |
|
|
|
1074 |
|
|
static int
|
1075 |
|
|
icmp6_notify_error(m, off, icmp6len, code)
|
1076 |
|
|
struct mbuf *m;
|
1077 |
|
|
int off, icmp6len;
|
1078 |
|
|
{
|
1079 |
|
|
struct icmp6_hdr *icmp6;
|
1080 |
|
|
struct ip6_hdr *eip6;
|
1081 |
|
|
u_int32_t notifymtu;
|
1082 |
|
|
int64_t zoneid;
|
1083 |
|
|
struct sockaddr_in6 icmp6src, icmp6dst;
|
1084 |
|
|
|
1085 |
|
|
if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
|
1086 |
|
|
icmp6stat.icp6s_tooshort++;
|
1087 |
|
|
goto freeit;
|
1088 |
|
|
}
|
1089 |
|
|
#ifndef PULLDOWN_TEST
|
1090 |
|
|
IP6_EXTHDR_CHECK(m, off,
|
1091 |
|
|
sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
|
1092 |
|
|
-1);
|
1093 |
|
|
icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
|
1094 |
|
|
#else
|
1095 |
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
|
1096 |
|
|
sizeof(*icmp6) + sizeof(struct ip6_hdr));
|
1097 |
|
|
if (icmp6 == NULL) {
|
1098 |
|
|
icmp6stat.icp6s_tooshort++;
|
1099 |
|
|
return(-1);
|
1100 |
|
|
}
|
1101 |
|
|
#endif
|
1102 |
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
1103 |
|
|
|
1104 |
|
|
/* Detect the upper level protocol */
|
1105 |
|
|
{
|
1106 |
|
|
void (*ctlfunc) __P((int, struct sockaddr *, void *));
|
1107 |
|
|
u_int8_t nxt = eip6->ip6_nxt;
|
1108 |
|
|
int eoff = off + sizeof(struct icmp6_hdr) +
|
1109 |
|
|
sizeof(struct ip6_hdr);
|
1110 |
|
|
struct ip6ctlparam ip6cp;
|
1111 |
|
|
struct in6_addr *finaldst = NULL;
|
1112 |
|
|
int icmp6type = icmp6->icmp6_type;
|
1113 |
|
|
struct ip6_frag *fh;
|
1114 |
|
|
struct ip6_rthdr *rth;
|
1115 |
|
|
struct ip6_rthdr0 *rth0;
|
1116 |
|
|
int rthlen;
|
1117 |
|
|
|
1118 |
|
|
while (1) { /* XXX: should avoid infinite loop explicitly? */
|
1119 |
|
|
struct ip6_ext *eh;
|
1120 |
|
|
|
1121 |
|
|
switch (nxt) {
|
1122 |
|
|
case IPPROTO_HOPOPTS:
|
1123 |
|
|
case IPPROTO_DSTOPTS:
|
1124 |
|
|
case IPPROTO_AH:
|
1125 |
|
|
#ifndef PULLDOWN_TEST
|
1126 |
|
|
IP6_EXTHDR_CHECK(m, 0, eoff +
|
1127 |
|
|
sizeof(struct ip6_ext),
|
1128 |
|
|
-1);
|
1129 |
|
|
eh = (struct ip6_ext *)(mtod(m, caddr_t)
|
1130 |
|
|
+ eoff);
|
1131 |
|
|
#else
|
1132 |
|
|
IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
|
1133 |
|
|
eoff, sizeof(*eh));
|
1134 |
|
|
if (eh == NULL) {
|
1135 |
|
|
icmp6stat.icp6s_tooshort++;
|
1136 |
|
|
return(-1);
|
1137 |
|
|
}
|
1138 |
|
|
#endif
|
1139 |
|
|
|
1140 |
|
|
if (nxt == IPPROTO_AH)
|
1141 |
|
|
eoff += (eh->ip6e_len + 2) << 2;
|
1142 |
|
|
else
|
1143 |
|
|
eoff += (eh->ip6e_len + 1) << 3;
|
1144 |
|
|
nxt = eh->ip6e_nxt;
|
1145 |
|
|
break;
|
1146 |
|
|
case IPPROTO_ROUTING:
|
1147 |
|
|
/*
|
1148 |
|
|
* When the erroneous packet contains a
|
1149 |
|
|
* routing header, we should examine the
|
1150 |
|
|
* header to determine the final destination.
|
1151 |
|
|
* Otherwise, we can't properly update
|
1152 |
|
|
* information that depends on the final
|
1153 |
|
|
* destination (e.g. path MTU).
|
1154 |
|
|
*/
|
1155 |
|
|
#ifndef PULLDOWN_TEST
|
1156 |
|
|
IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
|
1157 |
|
|
-1);
|
1158 |
|
|
rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
|
1159 |
|
|
+ eoff);
|
1160 |
|
|
#else
|
1161 |
|
|
IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
|
1162 |
|
|
eoff, sizeof(*rth));
|
1163 |
|
|
if (rth == NULL) {
|
1164 |
|
|
icmp6stat.icp6s_tooshort++;
|
1165 |
|
|
return(-1);
|
1166 |
|
|
}
|
1167 |
|
|
#endif
|
1168 |
|
|
rthlen = (rth->ip6r_len + 1) << 3;
|
1169 |
|
|
/*
|
1170 |
|
|
* XXX: currently there is no
|
1171 |
|
|
* officially defined type other
|
1172 |
|
|
* than type-0.
|
1173 |
|
|
* Note that if the segment left field
|
1174 |
|
|
* is 0, all intermediate hops must
|
1175 |
|
|
* have been passed.
|
1176 |
|
|
*/
|
1177 |
|
|
if (rth->ip6r_segleft &&
|
1178 |
|
|
rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
|
1179 |
|
|
int hops;
|
1180 |
|
|
|
1181 |
|
|
#ifndef PULLDOWN_TEST
|
1182 |
|
|
IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
|
1183 |
|
|
-1);
|
1184 |
|
|
rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
|
1185 |
|
|
#else
|
1186 |
|
|
IP6_EXTHDR_GET(rth0,
|
1187 |
|
|
struct ip6_rthdr0 *, m,
|
1188 |
|
|
eoff, rthlen);
|
1189 |
|
|
if (rth0 == NULL) {
|
1190 |
|
|
icmp6stat.icp6s_tooshort++;
|
1191 |
|
|
return(-1);
|
1192 |
|
|
}
|
1193 |
|
|
#endif
|
1194 |
|
|
/* just ignore a bogus header */
|
1195 |
|
|
if ((rth0->ip6r0_len % 2) == 0 &&
|
1196 |
|
|
(hops = rth0->ip6r0_len/2))
|
1197 |
|
|
finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
|
1198 |
|
|
}
|
1199 |
|
|
eoff += rthlen;
|
1200 |
|
|
nxt = rth->ip6r_nxt;
|
1201 |
|
|
break;
|
1202 |
|
|
case IPPROTO_FRAGMENT:
|
1203 |
|
|
#ifndef PULLDOWN_TEST
|
1204 |
|
|
IP6_EXTHDR_CHECK(m, 0, eoff +
|
1205 |
|
|
sizeof(struct ip6_frag),
|
1206 |
|
|
-1);
|
1207 |
|
|
fh = (struct ip6_frag *)(mtod(m, caddr_t)
|
1208 |
|
|
+ eoff);
|
1209 |
|
|
#else
|
1210 |
|
|
IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
|
1211 |
|
|
eoff, sizeof(*fh));
|
1212 |
|
|
if (fh == NULL) {
|
1213 |
|
|
icmp6stat.icp6s_tooshort++;
|
1214 |
|
|
return(-1);
|
1215 |
|
|
}
|
1216 |
|
|
#endif
|
1217 |
|
|
/*
|
1218 |
|
|
* Data after a fragment header is meaningless
|
1219 |
|
|
* unless it is the first fragment, but
|
1220 |
|
|
* we'll go to the notify label for path MTU
|
1221 |
|
|
* discovery.
|
1222 |
|
|
*/
|
1223 |
|
|
if (fh->ip6f_offlg & IP6F_OFF_MASK)
|
1224 |
|
|
goto notify;
|
1225 |
|
|
|
1226 |
|
|
eoff += sizeof(struct ip6_frag);
|
1227 |
|
|
nxt = fh->ip6f_nxt;
|
1228 |
|
|
break;
|
1229 |
|
|
default:
|
1230 |
|
|
/*
|
1231 |
|
|
* This case includes ESP and the No Next
|
1232 |
|
|
* Header. In such cases going to the notify
|
1233 |
|
|
* label does not have any meaning
|
1234 |
|
|
* (i.e. ctlfunc will be NULL), but we go
|
1235 |
|
|
* anyway since we might have to update
|
1236 |
|
|
* path MTU information.
|
1237 |
|
|
*/
|
1238 |
|
|
goto notify;
|
1239 |
|
|
}
|
1240 |
|
|
}
|
1241 |
|
|
notify:
|
1242 |
|
|
#ifndef PULLDOWN_TEST
|
1243 |
|
|
icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
|
1244 |
|
|
#else
|
1245 |
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
|
1246 |
|
|
sizeof(*icmp6) + sizeof(struct ip6_hdr));
|
1247 |
|
|
if (icmp6 == NULL) {
|
1248 |
|
|
icmp6stat.icp6s_tooshort++;
|
1249 |
|
|
return(-1);
|
1250 |
|
|
}
|
1251 |
|
|
#endif
|
1252 |
|
|
|
1253 |
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
1254 |
|
|
bzero(&icmp6dst, sizeof(icmp6dst));
|
1255 |
|
|
icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
|
1256 |
|
|
icmp6dst.sin6_family = AF_INET6;
|
1257 |
|
|
if (finaldst == NULL)
|
1258 |
|
|
icmp6dst.sin6_addr = eip6->ip6_dst;
|
1259 |
|
|
else
|
1260 |
|
|
icmp6dst.sin6_addr = *finaldst;
|
1261 |
|
|
if ((zoneid = in6_addr2zoneid(m->m_pkthdr.rcvif,
|
1262 |
|
|
&icmp6dst.sin6_addr)) < 0)
|
1263 |
|
|
goto freeit;
|
1264 |
|
|
icmp6dst.sin6_scope_id = zoneid;
|
1265 |
|
|
if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst)) {
|
1266 |
|
|
/* should be impossbile */
|
1267 |
|
|
nd6log((LOG_DEBUG,
|
1268 |
|
|
"icmp6_notify_error: in6_embedscope failed\n"));
|
1269 |
|
|
goto freeit;
|
1270 |
|
|
}
|
1271 |
|
|
|
1272 |
|
|
/*
|
1273 |
|
|
* retrieve parameters from the inner IPv6 header, and convert
|
1274 |
|
|
* them into sockaddr structures.
|
1275 |
|
|
*/
|
1276 |
|
|
bzero(&icmp6src, sizeof(icmp6src));
|
1277 |
|
|
icmp6src.sin6_len = sizeof(struct sockaddr_in6);
|
1278 |
|
|
icmp6src.sin6_family = AF_INET6;
|
1279 |
|
|
icmp6src.sin6_addr = eip6->ip6_src;
|
1280 |
|
|
if ((zoneid = in6_addr2zoneid(m->m_pkthdr.rcvif,
|
1281 |
|
|
&icmp6src.sin6_addr)) < 0)
|
1282 |
|
|
goto freeit;
|
1283 |
|
|
icmp6src.sin6_scope_id = zoneid;
|
1284 |
|
|
if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src)) {
|
1285 |
|
|
/* should be impossbile */
|
1286 |
|
|
nd6log((LOG_DEBUG,
|
1287 |
|
|
"icmp6_notify_error: in6_embedscope failed\n"));
|
1288 |
|
|
goto freeit;
|
1289 |
|
|
}
|
1290 |
|
|
icmp6src.sin6_flowinfo =
|
1291 |
|
|
(eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
|
1292 |
|
|
|
1293 |
|
|
if (finaldst == NULL)
|
1294 |
|
|
finaldst = &eip6->ip6_dst;
|
1295 |
|
|
ip6cp.ip6c_m = m;
|
1296 |
|
|
ip6cp.ip6c_icmp6 = icmp6;
|
1297 |
|
|
ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
|
1298 |
|
|
ip6cp.ip6c_off = eoff;
|
1299 |
|
|
ip6cp.ip6c_finaldst = finaldst;
|
1300 |
|
|
ip6cp.ip6c_src = &icmp6src;
|
1301 |
|
|
ip6cp.ip6c_nxt = nxt;
|
1302 |
|
|
|
1303 |
|
|
if (icmp6type == ICMP6_PACKET_TOO_BIG) {
|
1304 |
|
|
notifymtu = ntohl(icmp6->icmp6_mtu);
|
1305 |
|
|
ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
|
1306 |
|
|
#if !(defined(__NetBSD__) || defined(__OpenBSD__))
|
1307 |
|
|
icmp6_mtudisc_update(&ip6cp, 1); /* XXX */
|
1308 |
|
|
#endif
|
1309 |
|
|
}
|
1310 |
|
|
|
1311 |
|
|
ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
|
1312 |
|
|
(inet6sw[ip6_protox[nxt]].pr_ctlinput);
|
1313 |
|
|
if (ctlfunc) {
|
1314 |
|
|
(void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
|
1315 |
|
|
&ip6cp);
|
1316 |
|
|
}
|
1317 |
|
|
}
|
1318 |
|
|
return(0);
|
1319 |
|
|
|
1320 |
|
|
freeit:
|
1321 |
|
|
m_freem(m);
|
1322 |
|
|
return(-1);
|
1323 |
|
|
}
|
1324 |
|
|
|
1325 |
|
|
void
|
1326 |
|
|
icmp6_mtudisc_update(ip6cp, validated)
|
1327 |
|
|
struct ip6ctlparam *ip6cp;
|
1328 |
|
|
int validated;
|
1329 |
|
|
{
|
1330 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
1331 |
|
|
unsigned long rtcount;
|
1332 |
|
|
struct icmp6_mtudisc_callback *mc;
|
1333 |
|
|
#endif
|
1334 |
|
|
struct in6_addr *dst = ip6cp->ip6c_finaldst;
|
1335 |
|
|
struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
|
1336 |
|
|
struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
|
1337 |
|
|
u_int mtu = ntohl(icmp6->icmp6_mtu);
|
1338 |
|
|
struct rtentry *rt = NULL;
|
1339 |
|
|
struct sockaddr_in6 sin6;
|
1340 |
|
|
#ifdef __bsdi__
|
1341 |
|
|
#ifdef NEW_STRUCT_ROUTE
|
1342 |
|
|
struct route ro6;
|
1343 |
|
|
#else
|
1344 |
|
|
struct route_in6 ro6;
|
1345 |
|
|
#endif
|
1346 |
|
|
#endif
|
1347 |
|
|
|
1348 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
1349 |
|
|
/*
|
1350 |
|
|
* allow non-validated cases if memory is plenty, to make traffic
|
1351 |
|
|
* from non-connected pcb happy.
|
1352 |
|
|
*/
|
1353 |
|
|
rtcount = rt_timer_count(icmp6_mtudisc_timeout_q);
|
1354 |
|
|
if (validated) {
|
1355 |
|
|
if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat)
|
1356 |
|
|
return;
|
1357 |
|
|
else if (0 <= icmp6_mtudisc_lowat &&
|
1358 |
|
|
rtcount > icmp6_mtudisc_lowat) {
|
1359 |
|
|
/*
|
1360 |
|
|
* XXX nuke a victim, install the new one.
|
1361 |
|
|
*/
|
1362 |
|
|
}
|
1363 |
|
|
} else {
|
1364 |
|
|
if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat)
|
1365 |
|
|
return;
|
1366 |
|
|
}
|
1367 |
|
|
#else
|
1368 |
|
|
if (!validated)
|
1369 |
|
|
return;
|
1370 |
|
|
#endif
|
1371 |
|
|
|
1372 |
|
|
bzero(&sin6, sizeof(sin6));
|
1373 |
|
|
sin6.sin6_family = PF_INET6;
|
1374 |
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
1375 |
|
|
sin6.sin6_addr = *dst;
|
1376 |
|
|
/* XXX normally, this won't happen */
|
1377 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(dst)) {
|
1378 |
|
|
sin6.sin6_addr.s6_addr16[1] =
|
1379 |
|
|
htons(m->m_pkthdr.rcvif->if_index);
|
1380 |
|
|
}
|
1381 |
|
|
/* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
|
1382 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
1383 |
|
|
rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6);
|
1384 |
|
|
#else
|
1385 |
|
|
#ifdef __FreeBSD__
|
1386 |
|
|
rt = rtalloc1((struct sockaddr *)&sin6, 0,
|
1387 |
|
|
RTF_CLONING | RTF_PRCLONING);
|
1388 |
|
|
#else
|
1389 |
|
|
#ifdef __bsdi__
|
1390 |
|
|
bcopy(&sin6, &ro6.ro_dst, sizeof(struct sockaddr_in6));
|
1391 |
|
|
ro6.ro_rt = 0;
|
1392 |
|
|
/* rtcalloc((struct route *)&ro6); */
|
1393 |
|
|
rtalloc((struct route *)&ro6);
|
1394 |
|
|
rt = ro6.ro_rt;
|
1395 |
|
|
#else
|
1396 |
|
|
#error no case for this particular operating system
|
1397 |
|
|
#endif
|
1398 |
|
|
#endif
|
1399 |
|
|
#endif
|
1400 |
|
|
|
1401 |
|
|
if (rt && (rt->rt_flags & RTF_HOST)
|
1402 |
|
|
&& !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
|
1403 |
|
|
if (mtu < IPV6_MMTU) {
|
1404 |
|
|
/* xxx */
|
1405 |
|
|
rt->rt_rmx.rmx_locks |= RTV_MTU;
|
1406 |
|
|
} else if (mtu < rt->rt_ifp->if_mtu &&
|
1407 |
|
|
rt->rt_rmx.rmx_mtu > mtu) {
|
1408 |
|
|
icmp6stat.icp6s_pmtuchg++;
|
1409 |
|
|
rt->rt_rmx.rmx_mtu = mtu;
|
1410 |
|
|
}
|
1411 |
|
|
}
|
1412 |
|
|
if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */
|
1413 |
|
|
RTFREE(rt);
|
1414 |
|
|
}
|
1415 |
|
|
|
1416 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
1417 |
|
|
/*
|
1418 |
|
|
* Notify protocols that the MTU for this destination
|
1419 |
|
|
* has changed.
|
1420 |
|
|
*/
|
1421 |
|
|
for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
|
1422 |
|
|
mc = LIST_NEXT(mc, mc_list))
|
1423 |
|
|
(*mc->mc_func)(&sin6.sin6_addr);
|
1424 |
|
|
#endif
|
1425 |
|
|
}
|
1426 |
|
|
|
1427 |
|
|
/*
|
1428 |
|
|
* Process a Node Information Query packet, based on
|
1429 |
|
|
* draft-ietf-ipngwg-icmp-name-lookups-07.
|
1430 |
|
|
*
|
1431 |
|
|
* Spec incompatibilities:
|
1432 |
|
|
* - IPv6 Subject address handling
|
1433 |
|
|
* - IPv4 Subject address handling support missing
|
1434 |
|
|
* - Proxy reply (answer even if it's not for me)
|
1435 |
|
|
* - joins NI group address at in6_ifattach() time only, does not cope
|
1436 |
|
|
* with hostname changes by sethostname(3)
|
1437 |
|
|
*/
|
1438 |
|
|
#ifdef __FreeBSD__
|
1439 |
|
|
#define hostnamelen strlen(hostname)
|
1440 |
|
|
#endif
|
1441 |
|
|
#ifndef offsetof /* XXX */
|
1442 |
|
|
#define offsetof(type, member) ((size_t)(&((type *)0)->member))
|
1443 |
|
|
#endif
|
1444 |
|
|
static struct mbuf *
|
1445 |
|
|
ni6_input(m, off)
|
1446 |
|
|
struct mbuf *m;
|
1447 |
|
|
int off;
|
1448 |
|
|
{
|
1449 |
|
|
struct icmp6_nodeinfo *ni6, *nni6;
|
1450 |
|
|
struct mbuf *n = NULL;
|
1451 |
|
|
u_int16_t qtype;
|
1452 |
|
|
int subjlen;
|
1453 |
|
|
int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
|
1454 |
|
|
struct ni_reply_fqdn *fqdn;
|
1455 |
|
|
int addrs; /* for NI_QTYPE_NODEADDR */
|
1456 |
|
|
struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
|
1457 |
|
|
struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
|
1458 |
|
|
struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
|
1459 |
|
|
struct ip6_hdr *ip6;
|
1460 |
|
|
int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
|
1461 |
|
|
char *subj = NULL;
|
1462 |
|
|
struct in6_ifaddr *ia6 = NULL;
|
1463 |
|
|
int64_t zoneid;
|
1464 |
|
|
|
1465 |
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
1466 |
|
|
#ifndef PULLDOWN_TEST
|
1467 |
|
|
ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
|
1468 |
|
|
#else
|
1469 |
|
|
IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
|
1470 |
|
|
if (ni6 == NULL) {
|
1471 |
|
|
/* m is already reclaimed */
|
1472 |
|
|
return NULL;
|
1473 |
|
|
}
|
1474 |
|
|
#endif
|
1475 |
|
|
|
1476 |
|
|
/*
|
1477 |
|
|
* Validate IPv6 destination address.
|
1478 |
|
|
*
|
1479 |
|
|
* The Responder must discard the Query without further processing
|
1480 |
|
|
* unless it is one of the Responder's unicast or anycast addresses, or
|
1481 |
|
|
* a link-local scope multicast address which the Responder has joined.
|
1482 |
|
|
* [icmp-name-lookups-07, Section 4.]
|
1483 |
|
|
*/
|
1484 |
|
|
bzero(&sin6, sizeof(sin6));
|
1485 |
|
|
sin6.sin6_family = AF_INET6;
|
1486 |
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
1487 |
|
|
bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
|
1488 |
|
|
/* XXX scopeid */
|
1489 |
|
|
if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
|
1490 |
|
|
/* unicast/anycast, fine */
|
1491 |
|
|
if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
|
1492 |
|
|
(icmp6_nodeinfo & 4) == 0) {
|
1493 |
|
|
nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
|
1494 |
|
|
"a temporary address in %s:%d",
|
1495 |
|
|
__FILE__, __LINE__));
|
1496 |
|
|
goto bad;
|
1497 |
|
|
}
|
1498 |
|
|
} else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
|
1499 |
|
|
; /* link-local multicast, fine */
|
1500 |
|
|
else
|
1501 |
|
|
goto bad;
|
1502 |
|
|
|
1503 |
|
|
/* validate query Subject field. */
|
1504 |
|
|
qtype = ntohs(ni6->ni_qtype);
|
1505 |
|
|
subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
|
1506 |
|
|
switch (qtype) {
|
1507 |
|
|
case NI_QTYPE_NOOP:
|
1508 |
|
|
case NI_QTYPE_SUPTYPES:
|
1509 |
|
|
/* 07 draft */
|
1510 |
|
|
if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
|
1511 |
|
|
break;
|
1512 |
|
|
/* FALLTHROUGH */
|
1513 |
|
|
case NI_QTYPE_FQDN:
|
1514 |
|
|
case NI_QTYPE_NODEADDR:
|
1515 |
|
|
case NI_QTYPE_IPV4ADDR:
|
1516 |
|
|
switch (ni6->ni_code) {
|
1517 |
|
|
case ICMP6_NI_SUBJ_IPV6:
|
1518 |
|
|
#if ICMP6_NI_SUBJ_IPV6 != 0
|
1519 |
|
|
case 0:
|
1520 |
|
|
#endif
|
1521 |
|
|
/*
|
1522 |
|
|
* backward compatibility - try to accept 03 draft
|
1523 |
|
|
* format, where no Subject is present.
|
1524 |
|
|
*/
|
1525 |
|
|
if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
|
1526 |
|
|
subjlen == 0) {
|
1527 |
|
|
oldfqdn++;
|
1528 |
|
|
break;
|
1529 |
|
|
}
|
1530 |
|
|
#if ICMP6_NI_SUBJ_IPV6 != 0
|
1531 |
|
|
if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
|
1532 |
|
|
goto bad;
|
1533 |
|
|
#endif
|
1534 |
|
|
|
1535 |
|
|
if (subjlen != sizeof(sin6.sin6_addr))
|
1536 |
|
|
goto bad;
|
1537 |
|
|
|
1538 |
|
|
/*
|
1539 |
|
|
* Validate Subject address.
|
1540 |
|
|
*
|
1541 |
|
|
* Not sure what exactly "address belongs to the node"
|
1542 |
|
|
* means in the spec, is it just unicast, or what?
|
1543 |
|
|
*
|
1544 |
|
|
* At this moment we consider Subject address as
|
1545 |
|
|
* "belong to the node" if the Subject address equals
|
1546 |
|
|
* to the IPv6 destination address; validation for
|
1547 |
|
|
* IPv6 destination address should have done enough
|
1548 |
|
|
* check for us.
|
1549 |
|
|
*
|
1550 |
|
|
* We do not do proxy at this moment.
|
1551 |
|
|
*/
|
1552 |
|
|
/* m_pulldown instead of copy? */
|
1553 |
|
|
m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
|
1554 |
|
|
subjlen, (caddr_t)&sin6.sin6_addr);
|
1555 |
|
|
if ((zoneid = in6_addr2zoneid(m->m_pkthdr.rcvif,
|
1556 |
|
|
&sin6.sin6_addr)) < 0)
|
1557 |
|
|
goto bad;
|
1558 |
|
|
sin6.sin6_scope_id = zoneid;
|
1559 |
|
|
|
1560 |
|
|
if (in6_embedscope(&sin6.sin6_addr, &sin6))
|
1561 |
|
|
goto bad; /* XXX should not happen */
|
1562 |
|
|
bzero(&sin6_d, sizeof(sin6_d));
|
1563 |
|
|
sin6_d.sin6_family = AF_INET6; /* not used, actually */
|
1564 |
|
|
sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
|
1565 |
|
|
sin6_d.sin6_addr = ip6->ip6_dst;
|
1566 |
|
|
if ((zoneid = in6_addr2zoneid(m->m_pkthdr.rcvif,
|
1567 |
|
|
&ip6->ip6_dst)) < 0)
|
1568 |
|
|
goto bad;
|
1569 |
|
|
sin6_d.sin6_scope_id = zoneid;
|
1570 |
|
|
if (in6_embedscope(&sin6_d.sin6_addr, &sin6_d))
|
1571 |
|
|
goto bad; /* XXX should not happen */
|
1572 |
|
|
subj = (char *)&sin6;
|
1573 |
|
|
if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
|
1574 |
|
|
break;
|
1575 |
|
|
|
1576 |
|
|
/*
|
1577 |
|
|
* XXX if we are to allow other cases, we should really
|
1578 |
|
|
* be careful about scope here.
|
1579 |
|
|
* basically, we should disallow queries toward IPv6
|
1580 |
|
|
* destination X with subject Y, if scope(X) > scope(Y).
|
1581 |
|
|
* if we allow scope(X) > scope(Y), it will result in
|
1582 |
|
|
* information leakage across scope boundary.
|
1583 |
|
|
*/
|
1584 |
|
|
goto bad;
|
1585 |
|
|
|
1586 |
|
|
case ICMP6_NI_SUBJ_FQDN:
|
1587 |
|
|
/*
|
1588 |
|
|
* Validate Subject name with gethostname(3).
|
1589 |
|
|
*
|
1590 |
|
|
* The behavior may need some debate, since:
|
1591 |
|
|
* - we are not sure if the node has FQDN as
|
1592 |
|
|
* hostname (returned by gethostname(3)).
|
1593 |
|
|
* - the code does wildcard match for truncated names.
|
1594 |
|
|
* however, we are not sure if we want to perform
|
1595 |
|
|
* wildcard match, if gethostname(3) side has
|
1596 |
|
|
* truncated hostname.
|
1597 |
|
|
*/
|
1598 |
|
|
n = ni6_nametodns(hostname, hostnamelen, 0);
|
1599 |
|
|
if (!n || n->m_next || n->m_len == 0)
|
1600 |
|
|
goto bad;
|
1601 |
|
|
IP6_EXTHDR_GET(subj, char *, m,
|
1602 |
|
|
off + sizeof(struct icmp6_nodeinfo), subjlen);
|
1603 |
|
|
if (subj == NULL)
|
1604 |
|
|
goto bad;
|
1605 |
|
|
if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
|
1606 |
|
|
n->m_len)) {
|
1607 |
|
|
goto bad;
|
1608 |
|
|
}
|
1609 |
|
|
m_freem(n);
|
1610 |
|
|
n = NULL;
|
1611 |
|
|
break;
|
1612 |
|
|
|
1613 |
|
|
case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
|
1614 |
|
|
default:
|
1615 |
|
|
goto bad;
|
1616 |
|
|
}
|
1617 |
|
|
break;
|
1618 |
|
|
}
|
1619 |
|
|
|
1620 |
|
|
/* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
|
1621 |
|
|
switch (qtype) {
|
1622 |
|
|
case NI_QTYPE_FQDN:
|
1623 |
|
|
if ((icmp6_nodeinfo & 1) == 0)
|
1624 |
|
|
goto bad;
|
1625 |
|
|
break;
|
1626 |
|
|
case NI_QTYPE_NODEADDR:
|
1627 |
|
|
case NI_QTYPE_IPV4ADDR:
|
1628 |
|
|
if ((icmp6_nodeinfo & 2) == 0)
|
1629 |
|
|
goto bad;
|
1630 |
|
|
break;
|
1631 |
|
|
}
|
1632 |
|
|
|
1633 |
|
|
/* guess reply length */
|
1634 |
|
|
switch (qtype) {
|
1635 |
|
|
case NI_QTYPE_NOOP:
|
1636 |
|
|
break; /* no reply data */
|
1637 |
|
|
case NI_QTYPE_SUPTYPES:
|
1638 |
|
|
replylen += sizeof(u_int32_t);
|
1639 |
|
|
break;
|
1640 |
|
|
case NI_QTYPE_FQDN:
|
1641 |
|
|
/* XXX will append an mbuf */
|
1642 |
|
|
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
|
1643 |
|
|
break;
|
1644 |
|
|
case NI_QTYPE_NODEADDR:
|
1645 |
|
|
addrs = ni6_addrs(ni6, m, &ifp, subj);
|
1646 |
|
|
if ((replylen += addrs * (sizeof(struct in6_addr) +
|
1647 |
|
|
sizeof(u_int32_t))) > MCLBYTES)
|
1648 |
|
|
replylen = MCLBYTES; /* XXX: will truncate pkt later */
|
1649 |
|
|
break;
|
1650 |
|
|
case NI_QTYPE_IPV4ADDR:
|
1651 |
|
|
/* unsupported - should respond with unknown Qtype? */
|
1652 |
|
|
goto bad;
|
1653 |
|
|
default:
|
1654 |
|
|
/*
|
1655 |
|
|
* XXX: We must return a reply with the ICMP6 code
|
1656 |
|
|
* `unknown Qtype' in this case. However we regard the case
|
1657 |
|
|
* as an FQDN query for backward compatibility.
|
1658 |
|
|
* Older versions set a random value to this field,
|
1659 |
|
|
* so it rarely varies in the defined qtypes.
|
1660 |
|
|
* But the mechanism is not reliable...
|
1661 |
|
|
* maybe we should obsolete older versions.
|
1662 |
|
|
*/
|
1663 |
|
|
qtype = NI_QTYPE_FQDN;
|
1664 |
|
|
/* XXX will append an mbuf */
|
1665 |
|
|
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
|
1666 |
|
|
oldfqdn++;
|
1667 |
|
|
break;
|
1668 |
|
|
}
|
1669 |
|
|
|
1670 |
|
|
/* allocate an mbuf to reply. */
|
1671 |
|
|
MGETHDR(n, M_DONTWAIT, m->m_type);
|
1672 |
|
|
if (n == NULL) {
|
1673 |
|
|
m_freem(m);
|
1674 |
|
|
return(NULL);
|
1675 |
|
|
}
|
1676 |
|
|
#ifdef __OpenBSD__
|
1677 |
|
|
M_DUP_PKTHDR(n, m); /* just for rcvif */
|
1678 |
|
|
#else
|
1679 |
|
|
M_COPY_PKTHDR(n, m); /* just for rcvif */
|
1680 |
|
|
#endif
|
1681 |
|
|
if (replylen > MHLEN) {
|
1682 |
|
|
if (replylen > MCLBYTES) {
|
1683 |
|
|
/*
|
1684 |
|
|
* XXX: should we try to allocate more? But MCLBYTES
|
1685 |
|
|
* is probably much larger than IPV6_MMTU...
|
1686 |
|
|
*/
|
1687 |
|
|
goto bad;
|
1688 |
|
|
}
|
1689 |
|
|
MCLGET(n, M_DONTWAIT);
|
1690 |
|
|
if ((n->m_flags & M_EXT) == 0) {
|
1691 |
|
|
goto bad;
|
1692 |
|
|
}
|
1693 |
|
|
}
|
1694 |
|
|
n->m_pkthdr.len = n->m_len = replylen;
|
1695 |
|
|
|
1696 |
|
|
/* copy mbuf header and IPv6 + Node Information base headers */
|
1697 |
|
|
bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
|
1698 |
|
|
nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
|
1699 |
|
|
bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
|
1700 |
|
|
|
1701 |
|
|
/* qtype dependent procedure */
|
1702 |
|
|
switch (qtype) {
|
1703 |
|
|
case NI_QTYPE_NOOP:
|
1704 |
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
1705 |
|
|
nni6->ni_flags = 0;
|
1706 |
|
|
break;
|
1707 |
|
|
case NI_QTYPE_SUPTYPES:
|
1708 |
|
|
{
|
1709 |
|
|
u_int32_t v;
|
1710 |
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
1711 |
|
|
nni6->ni_flags = htons(0x0000); /* raw bitmap */
|
1712 |
|
|
/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
|
1713 |
|
|
v = (u_int32_t)htonl(0x0000000f);
|
1714 |
|
|
bcopy(&v, nni6 + 1, sizeof(u_int32_t));
|
1715 |
|
|
break;
|
1716 |
|
|
}
|
1717 |
|
|
case NI_QTYPE_FQDN:
|
1718 |
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
1719 |
|
|
fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
|
1720 |
|
|
sizeof(struct ip6_hdr) +
|
1721 |
|
|
sizeof(struct icmp6_nodeinfo));
|
1722 |
|
|
nni6->ni_flags = 0; /* XXX: meaningless TTL */
|
1723 |
|
|
fqdn->ni_fqdn_ttl = 0; /* ditto. */
|
1724 |
|
|
/*
|
1725 |
|
|
* XXX do we really have FQDN in variable "hostname"?
|
1726 |
|
|
*/
|
1727 |
|
|
n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
|
1728 |
|
|
if (n->m_next == NULL)
|
1729 |
|
|
goto bad;
|
1730 |
|
|
/* XXX we assume that n->m_next is not a chain */
|
1731 |
|
|
if (n->m_next->m_next != NULL)
|
1732 |
|
|
goto bad;
|
1733 |
|
|
n->m_pkthdr.len += n->m_next->m_len;
|
1734 |
|
|
break;
|
1735 |
|
|
case NI_QTYPE_NODEADDR:
|
1736 |
|
|
{
|
1737 |
|
|
int lenlim, copied;
|
1738 |
|
|
|
1739 |
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
1740 |
|
|
n->m_pkthdr.len = n->m_len =
|
1741 |
|
|
sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
|
1742 |
|
|
lenlim = M_TRAILINGSPACE(n);
|
1743 |
|
|
copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
|
1744 |
|
|
/* XXX: reset mbuf length */
|
1745 |
|
|
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
|
1746 |
|
|
sizeof(struct icmp6_nodeinfo) + copied;
|
1747 |
|
|
break;
|
1748 |
|
|
}
|
1749 |
|
|
default:
|
1750 |
|
|
break; /* XXX impossible! */
|
1751 |
|
|
}
|
1752 |
|
|
|
1753 |
|
|
nni6->ni_type = ICMP6_NI_REPLY;
|
1754 |
|
|
m_freem(m);
|
1755 |
|
|
return(n);
|
1756 |
|
|
|
1757 |
|
|
bad:
|
1758 |
|
|
m_freem(m);
|
1759 |
|
|
if (n)
|
1760 |
|
|
m_freem(n);
|
1761 |
|
|
return(NULL);
|
1762 |
|
|
}
|
1763 |
|
|
#undef hostnamelen
|
1764 |
|
|
|
1765 |
|
|
/*
|
1766 |
|
|
* make a mbuf with DNS-encoded string. no compression support.
|
1767 |
|
|
*
|
1768 |
|
|
* XXX names with less than 2 dots (like "foo" or "foo.section") will be
|
1769 |
|
|
* treated as truncated name (two \0 at the end). this is a wild guess.
|
1770 |
|
|
*/
|
1771 |
|
|
static struct mbuf *
|
1772 |
|
|
ni6_nametodns(name, namelen, old)
|
1773 |
|
|
const char *name;
|
1774 |
|
|
int namelen;
|
1775 |
|
|
int old; /* return pascal string if non-zero */
|
1776 |
|
|
{
|
1777 |
|
|
struct mbuf *m;
|
1778 |
|
|
char *cp, *ep;
|
1779 |
|
|
const char *p, *q;
|
1780 |
|
|
int i, len, nterm;
|
1781 |
|
|
|
1782 |
|
|
if (old)
|
1783 |
|
|
len = namelen + 1;
|
1784 |
|
|
else
|
1785 |
|
|
len = MCLBYTES;
|
1786 |
|
|
|
1787 |
|
|
/* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
|
1788 |
|
|
MGET(m, M_DONTWAIT, MT_DATA);
|
1789 |
|
|
if (m && len > MLEN) {
|
1790 |
|
|
MCLGET(m, M_DONTWAIT);
|
1791 |
|
|
if ((m->m_flags & M_EXT) == 0)
|
1792 |
|
|
goto fail;
|
1793 |
|
|
}
|
1794 |
|
|
if (!m)
|
1795 |
|
|
goto fail;
|
1796 |
|
|
m->m_next = NULL;
|
1797 |
|
|
|
1798 |
|
|
if (old) {
|
1799 |
|
|
m->m_len = len;
|
1800 |
|
|
*mtod(m, char *) = namelen;
|
1801 |
|
|
bcopy(name, mtod(m, char *) + 1, namelen);
|
1802 |
|
|
return m;
|
1803 |
|
|
} else {
|
1804 |
|
|
m->m_len = 0;
|
1805 |
|
|
cp = mtod(m, char *);
|
1806 |
|
|
ep = mtod(m, char *) + M_TRAILINGSPACE(m);
|
1807 |
|
|
|
1808 |
|
|
/* if not certain about my name, return empty buffer */
|
1809 |
|
|
if (namelen == 0)
|
1810 |
|
|
return m;
|
1811 |
|
|
|
1812 |
|
|
/*
|
1813 |
|
|
* guess if it looks like shortened hostname, or FQDN.
|
1814 |
|
|
* shortened hostname needs two trailing "\0".
|
1815 |
|
|
*/
|
1816 |
|
|
i = 0;
|
1817 |
|
|
for (p = name; p < name + namelen; p++) {
|
1818 |
|
|
if (*p && *p == '.')
|
1819 |
|
|
i++;
|
1820 |
|
|
}
|
1821 |
|
|
if (i < 2)
|
1822 |
|
|
nterm = 2;
|
1823 |
|
|
else
|
1824 |
|
|
nterm = 1;
|
1825 |
|
|
|
1826 |
|
|
p = name;
|
1827 |
|
|
while (cp < ep && p < name + namelen) {
|
1828 |
|
|
i = 0;
|
1829 |
|
|
for (q = p; q < name + namelen && *q && *q != '.'; q++)
|
1830 |
|
|
i++;
|
1831 |
|
|
/* result does not fit into mbuf */
|
1832 |
|
|
if (cp + i + 1 >= ep)
|
1833 |
|
|
goto fail;
|
1834 |
|
|
/*
|
1835 |
|
|
* DNS label length restriction, RFC1035 page 8.
|
1836 |
|
|
* "i == 0" case is included here to avoid returning
|
1837 |
|
|
* 0-length label on "foo..bar".
|
1838 |
|
|
*/
|
1839 |
|
|
if (i <= 0 || i >= 64)
|
1840 |
|
|
goto fail;
|
1841 |
|
|
*cp++ = i;
|
1842 |
|
|
bcopy(p, cp, i);
|
1843 |
|
|
cp += i;
|
1844 |
|
|
p = q;
|
1845 |
|
|
if (p < name + namelen && *p == '.')
|
1846 |
|
|
p++;
|
1847 |
|
|
}
|
1848 |
|
|
/* termination */
|
1849 |
|
|
if (cp + nterm >= ep)
|
1850 |
|
|
goto fail;
|
1851 |
|
|
while (nterm-- > 0)
|
1852 |
|
|
*cp++ = '\0';
|
1853 |
|
|
m->m_len = cp - mtod(m, char *);
|
1854 |
|
|
return m;
|
1855 |
|
|
}
|
1856 |
|
|
|
1857 |
|
|
panic("should not reach here");
|
1858 |
|
|
/* NOTREACHED */
|
1859 |
|
|
|
1860 |
|
|
fail:
|
1861 |
|
|
if (m)
|
1862 |
|
|
m_freem(m);
|
1863 |
|
|
return NULL;
|
1864 |
|
|
}
|
1865 |
|
|
|
1866 |
|
|
/*
|
1867 |
|
|
* check if two DNS-encoded string matches. takes care of truncated
|
1868 |
|
|
* form (with \0\0 at the end). no compression support.
|
1869 |
|
|
* XXX upper/lowercase match (see RFC2065)
|
1870 |
|
|
*/
|
1871 |
|
|
static int
|
1872 |
|
|
ni6_dnsmatch(a, alen, b, blen)
|
1873 |
|
|
const char *a;
|
1874 |
|
|
int alen;
|
1875 |
|
|
const char *b;
|
1876 |
|
|
int blen;
|
1877 |
|
|
{
|
1878 |
|
|
const char *a0, *b0;
|
1879 |
|
|
int l;
|
1880 |
|
|
|
1881 |
|
|
/* simplest case - need validation? */
|
1882 |
|
|
if (alen == blen && bcmp(a, b, alen) == 0)
|
1883 |
|
|
return 1;
|
1884 |
|
|
|
1885 |
|
|
a0 = a;
|
1886 |
|
|
b0 = b;
|
1887 |
|
|
|
1888 |
|
|
/* termination is mandatory */
|
1889 |
|
|
if (alen < 2 || blen < 2)
|
1890 |
|
|
return 0;
|
1891 |
|
|
if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
|
1892 |
|
|
return 0;
|
1893 |
|
|
alen--;
|
1894 |
|
|
blen--;
|
1895 |
|
|
|
1896 |
|
|
while (a - a0 < alen && b - b0 < blen) {
|
1897 |
|
|
if (a - a0 + 1 > alen || b - b0 + 1 > blen)
|
1898 |
|
|
return 0;
|
1899 |
|
|
|
1900 |
|
|
if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
|
1901 |
|
|
return 0;
|
1902 |
|
|
/* we don't support compression yet */
|
1903 |
|
|
if (a[0] >= 64 || b[0] >= 64)
|
1904 |
|
|
return 0;
|
1905 |
|
|
|
1906 |
|
|
/* truncated case */
|
1907 |
|
|
if (a[0] == 0 && a - a0 == alen - 1)
|
1908 |
|
|
return 1;
|
1909 |
|
|
if (b[0] == 0 && b - b0 == blen - 1)
|
1910 |
|
|
return 1;
|
1911 |
|
|
if (a[0] == 0 || b[0] == 0)
|
1912 |
|
|
return 0;
|
1913 |
|
|
|
1914 |
|
|
if (a[0] != b[0])
|
1915 |
|
|
return 0;
|
1916 |
|
|
l = a[0];
|
1917 |
|
|
if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
|
1918 |
|
|
return 0;
|
1919 |
|
|
if (bcmp(a + 1, b + 1, l) != 0)
|
1920 |
|
|
return 0;
|
1921 |
|
|
|
1922 |
|
|
a += 1 + l;
|
1923 |
|
|
b += 1 + l;
|
1924 |
|
|
}
|
1925 |
|
|
|
1926 |
|
|
if (a - a0 == alen && b - b0 == blen)
|
1927 |
|
|
return 1;
|
1928 |
|
|
else
|
1929 |
|
|
return 0;
|
1930 |
|
|
}
|
1931 |
|
|
|
1932 |
|
|
/*
|
1933 |
|
|
* calculate the number of addresses to be returned in the node info reply.
|
1934 |
|
|
*/
|
1935 |
|
|
static int
|
1936 |
|
|
ni6_addrs(ni6, m, ifpp, subj)
|
1937 |
|
|
struct icmp6_nodeinfo *ni6;
|
1938 |
|
|
struct mbuf *m;
|
1939 |
|
|
struct ifnet **ifpp;
|
1940 |
|
|
char *subj;
|
1941 |
|
|
{
|
1942 |
|
|
struct ifnet *ifp;
|
1943 |
|
|
struct in6_ifaddr *ifa6;
|
1944 |
|
|
struct ifaddr *ifa;
|
1945 |
|
|
struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
|
1946 |
|
|
int addrs = 0, addrsofif, iffound = 0;
|
1947 |
|
|
int niflags = ni6->ni_flags;
|
1948 |
|
|
|
1949 |
|
|
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
|
1950 |
|
|
switch (ni6->ni_code) {
|
1951 |
|
|
case ICMP6_NI_SUBJ_IPV6:
|
1952 |
|
|
if (subj == NULL) /* must be impossible... */
|
1953 |
|
|
return(0);
|
1954 |
|
|
subj_ip6 = (struct sockaddr_in6 *)subj;
|
1955 |
|
|
break;
|
1956 |
|
|
default:
|
1957 |
|
|
/*
|
1958 |
|
|
* XXX: we only support IPv6 subject address for
|
1959 |
|
|
* this Qtype.
|
1960 |
|
|
*/
|
1961 |
|
|
return(0);
|
1962 |
|
|
}
|
1963 |
|
|
}
|
1964 |
|
|
|
1965 |
|
|
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
|
1966 |
|
|
for (ifp = ifnet; ifp; ifp = ifp->if_next)
|
1967 |
|
|
#else
|
1968 |
|
|
for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
|
1969 |
|
|
#endif
|
1970 |
|
|
{
|
1971 |
|
|
addrsofif = 0;
|
1972 |
|
|
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
|
1973 |
|
|
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
|
1974 |
|
|
#elif defined(__FreeBSD__) && __FreeBSD__ >= 4
|
1975 |
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
|
1976 |
|
|
#else
|
1977 |
|
|
for (ifa = ifp->if_addrlist.tqh_first; ifa;
|
1978 |
|
|
ifa = ifa->ifa_list.tqe_next)
|
1979 |
|
|
#endif
|
1980 |
|
|
{
|
1981 |
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
1982 |
|
|
continue;
|
1983 |
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
1984 |
|
|
|
1985 |
|
|
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
|
1986 |
|
|
IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
|
1987 |
|
|
&ifa6->ia_addr.sin6_addr))
|
1988 |
|
|
iffound = 1;
|
1989 |
|
|
|
1990 |
|
|
/*
|
1991 |
|
|
* IPv4-mapped addresses can only be returned by a
|
1992 |
|
|
* Node Information proxy, since they represent
|
1993 |
|
|
* addresses of IPv4-only nodes, which perforce do
|
1994 |
|
|
* not implement this protocol.
|
1995 |
|
|
* [icmp-name-lookups-07, Section 5.4]
|
1996 |
|
|
* So we don't support NI_NODEADDR_FLAG_COMPAT in
|
1997 |
|
|
* this function at this moment.
|
1998 |
|
|
*/
|
1999 |
|
|
|
2000 |
|
|
/* What do we have to do about ::1? */
|
2001 |
|
|
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
|
2002 |
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
2003 |
|
|
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
|
2004 |
|
|
continue;
|
2005 |
|
|
break;
|
2006 |
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
2007 |
|
|
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
|
2008 |
|
|
continue;
|
2009 |
|
|
break;
|
2010 |
|
|
case IPV6_ADDR_SCOPE_GLOBAL:
|
2011 |
|
|
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
|
2012 |
|
|
continue;
|
2013 |
|
|
break;
|
2014 |
|
|
default:
|
2015 |
|
|
continue;
|
2016 |
|
|
}
|
2017 |
|
|
|
2018 |
|
|
/*
|
2019 |
|
|
* check if anycast is okay.
|
2020 |
|
|
* XXX: just experimental. not in the spec.
|
2021 |
|
|
*/
|
2022 |
|
|
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
|
2023 |
|
|
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
|
2024 |
|
|
continue; /* we need only unicast addresses */
|
2025 |
|
|
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
|
2026 |
|
|
(icmp6_nodeinfo & 4) == 0) {
|
2027 |
|
|
continue;
|
2028 |
|
|
}
|
2029 |
|
|
addrsofif++; /* count the address */
|
2030 |
|
|
}
|
2031 |
|
|
if (iffound) {
|
2032 |
|
|
*ifpp = ifp;
|
2033 |
|
|
return(addrsofif);
|
2034 |
|
|
}
|
2035 |
|
|
|
2036 |
|
|
addrs += addrsofif;
|
2037 |
|
|
}
|
2038 |
|
|
|
2039 |
|
|
return(addrs);
|
2040 |
|
|
}
|
2041 |
|
|
|
2042 |
|
|
static int
|
2043 |
|
|
ni6_store_addrs(ni6, nni6, ifp0, resid)
|
2044 |
|
|
struct icmp6_nodeinfo *ni6, *nni6;
|
2045 |
|
|
struct ifnet *ifp0;
|
2046 |
|
|
int resid;
|
2047 |
|
|
{
|
2048 |
|
|
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
|
2049 |
|
|
struct ifnet *ifp = ifp0 ? ifp0 : ifnet;
|
2050 |
|
|
#else
|
2051 |
|
|
struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
|
2052 |
|
|
#endif
|
2053 |
|
|
struct in6_ifaddr *ifa6;
|
2054 |
|
|
struct ifaddr *ifa;
|
2055 |
|
|
struct ifnet *ifp_dep = NULL;
|
2056 |
|
|
int copied = 0, allow_deprecated = 0;
|
2057 |
|
|
u_char *cp = (u_char *)(nni6 + 1);
|
2058 |
|
|
int niflags = ni6->ni_flags;
|
2059 |
|
|
u_int32_t ltime;
|
2060 |
|
|
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
|
2061 |
|
|
long time_second = time.tv_sec;
|
2062 |
|
|
#endif
|
2063 |
|
|
|
2064 |
|
|
if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
|
2065 |
|
|
return(0); /* needless to copy */
|
2066 |
|
|
|
2067 |
|
|
again:
|
2068 |
|
|
|
2069 |
|
|
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
|
2070 |
|
|
for (; ifp; ifp = ifp->if_next)
|
2071 |
|
|
#else
|
2072 |
|
|
for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
|
2073 |
|
|
#endif
|
2074 |
|
|
{
|
2075 |
|
|
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
|
2076 |
|
|
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
|
2077 |
|
|
#else
|
2078 |
|
|
for (ifa = ifp->if_addrlist.tqh_first; ifa;
|
2079 |
|
|
ifa = ifa->ifa_list.tqe_next)
|
2080 |
|
|
#endif
|
2081 |
|
|
{
|
2082 |
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
2083 |
|
|
continue;
|
2084 |
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
2085 |
|
|
|
2086 |
|
|
if (IFA6_IS_DEPRECATED(ifa6) &&
|
2087 |
|
|
allow_deprecated == 0) {
|
2088 |
|
|
/*
|
2089 |
|
|
* prefererred address should be put before
|
2090 |
|
|
* deprecated addresses.
|
2091 |
|
|
*/
|
2092 |
|
|
|
2093 |
|
|
/* record the interface for later search */
|
2094 |
|
|
if (ifp_dep == NULL)
|
2095 |
|
|
ifp_dep = ifp;
|
2096 |
|
|
|
2097 |
|
|
continue;
|
2098 |
|
|
}
|
2099 |
|
|
else if (!IFA6_IS_DEPRECATED(ifa6) &&
|
2100 |
|
|
allow_deprecated != 0)
|
2101 |
|
|
continue; /* we now collect deprecated addrs */
|
2102 |
|
|
|
2103 |
|
|
/* What do we have to do about ::1? */
|
2104 |
|
|
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
|
2105 |
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
2106 |
|
|
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
|
2107 |
|
|
continue;
|
2108 |
|
|
break;
|
2109 |
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
2110 |
|
|
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
|
2111 |
|
|
continue;
|
2112 |
|
|
break;
|
2113 |
|
|
case IPV6_ADDR_SCOPE_GLOBAL:
|
2114 |
|
|
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
|
2115 |
|
|
continue;
|
2116 |
|
|
break;
|
2117 |
|
|
default:
|
2118 |
|
|
continue;
|
2119 |
|
|
}
|
2120 |
|
|
|
2121 |
|
|
/*
|
2122 |
|
|
* check if anycast is okay.
|
2123 |
|
|
* XXX: just experimental. not in the spec.
|
2124 |
|
|
*/
|
2125 |
|
|
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
|
2126 |
|
|
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
|
2127 |
|
|
continue;
|
2128 |
|
|
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
|
2129 |
|
|
(icmp6_nodeinfo & 4) == 0) {
|
2130 |
|
|
continue;
|
2131 |
|
|
}
|
2132 |
|
|
|
2133 |
|
|
/* now we can copy the address */
|
2134 |
|
|
if (resid < sizeof(struct in6_addr) +
|
2135 |
|
|
sizeof(u_int32_t)) {
|
2136 |
|
|
/*
|
2137 |
|
|
* We give up much more copy.
|
2138 |
|
|
* Set the truncate flag and return.
|
2139 |
|
|
*/
|
2140 |
|
|
nni6->ni_flags |=
|
2141 |
|
|
NI_NODEADDR_FLAG_TRUNCATE;
|
2142 |
|
|
return(copied);
|
2143 |
|
|
}
|
2144 |
|
|
|
2145 |
|
|
/*
|
2146 |
|
|
* Set the TTL of the address.
|
2147 |
|
|
* The TTL value should be one of the following
|
2148 |
|
|
* according to the specification:
|
2149 |
|
|
*
|
2150 |
|
|
* 1. The remaining lifetime of a DHCP lease on the
|
2151 |
|
|
* address, or
|
2152 |
|
|
* 2. The remaining Valid Lifetime of a prefix from
|
2153 |
|
|
* which the address was derived through Stateless
|
2154 |
|
|
* Autoconfiguration.
|
2155 |
|
|
*
|
2156 |
|
|
* Note that we currently do not support stateful
|
2157 |
|
|
* address configuration by DHCPv6, so the former
|
2158 |
|
|
* case can't happen.
|
2159 |
|
|
*
|
2160 |
|
|
* TTL must be 2^31 > TTL >= 0.
|
2161 |
|
|
*/
|
2162 |
|
|
if (ifa6->ia6_lifetime.ia6t_expire == 0)
|
2163 |
|
|
ltime = ND6_INFINITE_LIFETIME;
|
2164 |
|
|
else {
|
2165 |
|
|
if (ifa6->ia6_lifetime.ia6t_expire >
|
2166 |
|
|
time_second) {
|
2167 |
|
|
ltime = ifa6->ia6_lifetime.ia6t_expire
|
2168 |
|
|
- time_second;
|
2169 |
|
|
} else
|
2170 |
|
|
ltime = 0;
|
2171 |
|
|
}
|
2172 |
|
|
if (ltime > 0x7fffffff)
|
2173 |
|
|
ltime = 0x7fffffff;
|
2174 |
|
|
ltime = htonl(ltime);
|
2175 |
|
|
|
2176 |
|
|
bcopy(<ime, cp, sizeof(u_int32_t));
|
2177 |
|
|
cp += sizeof(u_int32_t);
|
2178 |
|
|
|
2179 |
|
|
/* copy the address itself */
|
2180 |
|
|
bcopy(&ifa6->ia_addr.sin6_addr, cp,
|
2181 |
|
|
sizeof(struct in6_addr));
|
2182 |
|
|
/* XXX: KAME link-local hack; remove ifindex */
|
2183 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
|
2184 |
|
|
((struct in6_addr *)cp)->s6_addr16[1] = 0;
|
2185 |
|
|
cp += sizeof(struct in6_addr);
|
2186 |
|
|
|
2187 |
|
|
resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
|
2188 |
|
|
copied += (sizeof(struct in6_addr) +
|
2189 |
|
|
sizeof(u_int32_t));
|
2190 |
|
|
}
|
2191 |
|
|
if (ifp0) /* we need search only on the specified IF */
|
2192 |
|
|
break;
|
2193 |
|
|
}
|
2194 |
|
|
|
2195 |
|
|
if (allow_deprecated == 0 && ifp_dep != NULL) {
|
2196 |
|
|
ifp = ifp_dep;
|
2197 |
|
|
allow_deprecated = 1;
|
2198 |
|
|
|
2199 |
|
|
goto again;
|
2200 |
|
|
}
|
2201 |
|
|
|
2202 |
|
|
return(copied);
|
2203 |
|
|
}
|
2204 |
|
|
|
2205 |
|
|
/*
|
2206 |
|
|
* XXX almost dup'ed code with rip6_input.
|
2207 |
|
|
*/
|
2208 |
|
|
static int
|
2209 |
|
|
icmp6_rip6_input(mp, off)
|
2210 |
|
|
struct mbuf **mp;
|
2211 |
|
|
int off;
|
2212 |
|
|
{
|
2213 |
|
|
struct mbuf *m = *mp;
|
2214 |
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
2215 |
|
|
struct in6pcb *in6p;
|
2216 |
|
|
struct in6pcb *last = NULL;
|
2217 |
|
|
struct sockaddr_in6 rip6src;
|
2218 |
|
|
struct icmp6_hdr *icmp6;
|
2219 |
|
|
struct ip6_recvpktopts opts;
|
2220 |
|
|
|
2221 |
|
|
#ifndef PULLDOWN_TEST
|
2222 |
|
|
/* this is assumed to be safe. */
|
2223 |
|
|
icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
|
2224 |
|
|
#else
|
2225 |
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
|
2226 |
|
|
if (icmp6 == NULL) {
|
2227 |
|
|
/* m is already reclaimed */
|
2228 |
|
|
return IPPROTO_DONE;
|
2229 |
|
|
}
|
2230 |
|
|
#endif
|
2231 |
|
|
|
2232 |
|
|
bzero(&opts, sizeof(opts));
|
2233 |
|
|
bzero(&rip6src, sizeof(rip6src));
|
2234 |
|
|
rip6src.sin6_len = sizeof(struct sockaddr_in6);
|
2235 |
|
|
rip6src.sin6_family = AF_INET6;
|
2236 |
|
|
/* KAME hack: recover scopeid */
|
2237 |
|
|
(void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
|
2238 |
|
|
|
2239 |
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
2240 |
|
|
LIST_FOREACH(in6p, &ripcb, inp_list)
|
2241 |
|
|
#elif defined(__OpenBSD__)
|
2242 |
|
|
for (in6p = rawin6pcbtable.inpt_queue.cqh_first;
|
2243 |
|
|
in6p != (struct inpcb *)&rawin6pcbtable.inpt_queue;
|
2244 |
|
|
in6p = in6p->inp_queue.cqe_next)
|
2245 |
|
|
#else
|
2246 |
|
|
for (in6p = rawin6pcb.in6p_next;
|
2247 |
|
|
in6p != &rawin6pcb; in6p = in6p->in6p_next)
|
2248 |
|
|
#endif
|
2249 |
|
|
{
|
2250 |
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
2251 |
|
|
if ((in6p->inp_vflag & INP_IPV6) == 0)
|
2252 |
|
|
continue;
|
2253 |
|
|
#endif
|
2254 |
|
|
#ifdef HAVE_NRL_INPCB
|
2255 |
|
|
if (!(in6p->in6p_flags & INP_IPV6))
|
2256 |
|
|
continue;
|
2257 |
|
|
#endif
|
2258 |
|
|
if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
|
2259 |
|
|
continue;
|
2260 |
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
|
2261 |
|
|
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
|
2262 |
|
|
continue;
|
2263 |
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
|
2264 |
|
|
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
|
2265 |
|
|
continue;
|
2266 |
|
|
if (in6p->in6p_icmp6filt
|
2267 |
|
|
&& ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
|
2268 |
|
|
in6p->in6p_icmp6filt))
|
2269 |
|
|
continue;
|
2270 |
|
|
if (last) {
|
2271 |
|
|
struct mbuf *n;
|
2272 |
|
|
if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
|
2273 |
|
|
if (last->in6p_flags & IN6P_CONTROLOPTS)
|
2274 |
|
|
ip6_savecontrol(last, ip6, n, &opts,
|
2275 |
|
|
NULL);
|
2276 |
|
|
/* strip intermediate headers */
|
2277 |
|
|
m_adj(n, off);
|
2278 |
|
|
if (sbappendaddr(&last->in6p_socket->so_rcv,
|
2279 |
|
|
(struct sockaddr *)&rip6src,
|
2280 |
|
|
n, opts.head) == 0) {
|
2281 |
|
|
/* should notify about lost packet */
|
2282 |
|
|
m_freem(n);
|
2283 |
|
|
if (opts.head) {
|
2284 |
|
|
m_freem(opts.head);
|
2285 |
|
|
}
|
2286 |
|
|
} else
|
2287 |
|
|
sorwakeup(last->in6p_socket);
|
2288 |
|
|
bzero(&opts, sizeof(opts));
|
2289 |
|
|
}
|
2290 |
|
|
}
|
2291 |
|
|
last = in6p;
|
2292 |
|
|
}
|
2293 |
|
|
if (last) {
|
2294 |
|
|
if (last->in6p_flags & IN6P_CONTROLOPTS)
|
2295 |
|
|
ip6_savecontrol(last, ip6, m, &opts, NULL);
|
2296 |
|
|
/* strip intermediate headers */
|
2297 |
|
|
m_adj(m, off);
|
2298 |
|
|
if (sbappendaddr(&last->in6p_socket->so_rcv,
|
2299 |
|
|
(struct sockaddr *)&rip6src,
|
2300 |
|
|
m, opts.head) == 0) {
|
2301 |
|
|
m_freem(m);
|
2302 |
|
|
if (opts.head)
|
2303 |
|
|
m_freem(opts.head);
|
2304 |
|
|
} else
|
2305 |
|
|
sorwakeup(last->in6p_socket);
|
2306 |
|
|
} else {
|
2307 |
|
|
m_freem(m);
|
2308 |
|
|
ip6stat.ip6s_delivered--;
|
2309 |
|
|
}
|
2310 |
|
|
return IPPROTO_DONE;
|
2311 |
|
|
}
|
2312 |
|
|
|
2313 |
|
|
/*
|
2314 |
|
|
* Reflect the ip6 packet back to the source.
|
2315 |
|
|
* OFF points to the icmp6 header, counted from the top of the mbuf.
|
2316 |
|
|
*
|
2317 |
|
|
* Note: RFC 1885 required that an echo reply should be truncated if it
|
2318 |
|
|
* did not fit in with (return) path MTU, and KAME code supported the
|
2319 |
|
|
* behavior. However, as a clarification after the RFC, this limitation
|
2320 |
|
|
* was removed in a revised version of the spec, RFC 2463. We had kept the
|
2321 |
|
|
* old behavior, with a (non-default) ifdef block, while the new version of
|
2322 |
|
|
* the spec was an internet-draft status, and even after the new RFC was
|
2323 |
|
|
* published. But it would rather make sense to clean the obsoleted part
|
2324 |
|
|
* up, and to make the code simpler at this stage.
|
2325 |
|
|
*/
|
2326 |
|
|
void
|
2327 |
|
|
icmp6_reflect(m, off)
|
2328 |
|
|
struct mbuf *m;
|
2329 |
|
|
size_t off;
|
2330 |
|
|
{
|
2331 |
|
|
struct ip6_hdr *ip6;
|
2332 |
|
|
struct icmp6_hdr *icmp6;
|
2333 |
|
|
struct in6_ifaddr *ia;
|
2334 |
|
|
struct in6_addr t, *src = 0;
|
2335 |
|
|
int plen;
|
2336 |
|
|
int type, code;
|
2337 |
|
|
struct ifnet *outif = NULL;
|
2338 |
|
|
struct sockaddr_in6 sa6_src, sa6_dst;
|
2339 |
|
|
|
2340 |
|
|
/* too short to reflect */
|
2341 |
|
|
if (off < sizeof(struct ip6_hdr)) {
|
2342 |
|
|
nd6log((LOG_DEBUG,
|
2343 |
|
|
"sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
|
2344 |
|
|
(u_long)off, (u_long)sizeof(struct ip6_hdr),
|
2345 |
|
|
__FILE__, __LINE__));
|
2346 |
|
|
goto bad;
|
2347 |
|
|
}
|
2348 |
|
|
|
2349 |
|
|
/*
|
2350 |
|
|
* If there are extra headers between IPv6 and ICMPv6, strip
|
2351 |
|
|
* off that header first.
|
2352 |
|
|
*/
|
2353 |
|
|
#ifdef DIAGNOSTIC
|
2354 |
|
|
if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
|
2355 |
|
|
panic("assumption failed in icmp6_reflect");
|
2356 |
|
|
#endif
|
2357 |
|
|
if (off > sizeof(struct ip6_hdr)) {
|
2358 |
|
|
size_t l;
|
2359 |
|
|
struct ip6_hdr nip6;
|
2360 |
|
|
|
2361 |
|
|
l = off - sizeof(struct ip6_hdr);
|
2362 |
|
|
m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
|
2363 |
|
|
m_adj(m, l);
|
2364 |
|
|
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
2365 |
|
|
if (m->m_len < l) {
|
2366 |
|
|
if ((m = m_pullup(m, l)) == NULL)
|
2367 |
|
|
return;
|
2368 |
|
|
}
|
2369 |
|
|
bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
|
2370 |
|
|
} else /* off == sizeof(struct ip6_hdr) */ {
|
2371 |
|
|
size_t l;
|
2372 |
|
|
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
2373 |
|
|
if (m->m_len < l) {
|
2374 |
|
|
if ((m = m_pullup(m, l)) == NULL)
|
2375 |
|
|
return;
|
2376 |
|
|
}
|
2377 |
|
|
}
|
2378 |
|
|
plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
|
2379 |
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
2380 |
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
2381 |
|
|
icmp6 = (struct icmp6_hdr *)(ip6 + 1);
|
2382 |
|
|
type = icmp6->icmp6_type; /* keep type for statistics */
|
2383 |
|
|
code = icmp6->icmp6_code; /* ditto. */
|
2384 |
|
|
|
2385 |
|
|
t = ip6->ip6_dst;
|
2386 |
|
|
/*
|
2387 |
|
|
* ip6_input() drops a packet if its src is multicast.
|
2388 |
|
|
* So, the src is never multicast.
|
2389 |
|
|
*/
|
2390 |
|
|
ip6->ip6_dst = ip6->ip6_src;
|
2391 |
|
|
|
2392 |
|
|
/*
|
2393 |
|
|
* XXX: make sure to embed scope zone information, using
|
2394 |
|
|
* already embedded IDs or the received interface (if any).
|
2395 |
|
|
* Note that rcvif may be NULL.
|
2396 |
|
|
* TODO: scoped routing case (XXX).
|
2397 |
|
|
*/
|
2398 |
|
|
bzero(&sa6_src, sizeof(sa6_src));
|
2399 |
|
|
sa6_src.sin6_family = AF_INET6;
|
2400 |
|
|
sa6_src.sin6_len = sizeof(sa6_src);
|
2401 |
|
|
sa6_src.sin6_addr = ip6->ip6_dst;
|
2402 |
|
|
in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
|
2403 |
|
|
in6_embedscope(&sa6_src.sin6_addr, &sa6_src);
|
2404 |
|
|
ip6->ip6_dst = sa6_src.sin6_addr;
|
2405 |
|
|
|
2406 |
|
|
bzero(&sa6_dst, sizeof(sa6_dst));
|
2407 |
|
|
sa6_dst.sin6_family = AF_INET6;
|
2408 |
|
|
sa6_dst.sin6_len = sizeof(sa6_dst);
|
2409 |
|
|
sa6_dst.sin6_addr = t;
|
2410 |
|
|
in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
|
2411 |
|
|
in6_embedscope(&t, &sa6_dst);
|
2412 |
|
|
|
2413 |
|
|
/*
|
2414 |
|
|
* If the incoming packet was addressed directly to us (i.e. unicast),
|
2415 |
|
|
* use dst as the src for the reply.
|
2416 |
|
|
* The IN6_IFF_NOTREADY case would be VERY rare, but is possible
|
2417 |
|
|
* (for example) when we encounter an error while forwarding procedure
|
2418 |
|
|
* destined to a duplicated address of ours.
|
2419 |
|
|
*/
|
2420 |
|
|
for (ia = in6_ifaddr; ia; ia = ia->ia_next)
|
2421 |
|
|
if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
|
2422 |
|
|
(ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
|
2423 |
|
|
src = &t;
|
2424 |
|
|
break;
|
2425 |
|
|
}
|
2426 |
|
|
if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
|
2427 |
|
|
/*
|
2428 |
|
|
* This is the case if the dst is our link-local address
|
2429 |
|
|
* and the sender is also ourselves.
|
2430 |
|
|
*/
|
2431 |
|
|
src = &t;
|
2432 |
|
|
}
|
2433 |
|
|
|
2434 |
|
|
if (src == 0) {
|
2435 |
|
|
int e;
|
2436 |
|
|
#ifdef NEW_STRUCT_ROUTE
|
2437 |
|
|
struct route ro;
|
2438 |
|
|
#else
|
2439 |
|
|
struct route_in6 ro;
|
2440 |
|
|
#endif
|
2441 |
|
|
|
2442 |
|
|
/*
|
2443 |
|
|
* This case matches to multicasts, our anycast, or unicasts
|
2444 |
|
|
* that we do not own. Select a source address based on the
|
2445 |
|
|
* source address of the erroneous packet.
|
2446 |
|
|
*/
|
2447 |
|
|
bzero(&ro, sizeof(ro));
|
2448 |
|
|
src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, NULL, &e);
|
2449 |
|
|
if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */
|
2450 |
|
|
RTFREE(ro.ro_rt); /* XXX: we could use this */
|
2451 |
|
|
}
|
2452 |
|
|
if (src == NULL) {
|
2453 |
|
|
nd6log((LOG_DEBUG,
|
2454 |
|
|
"icmp6_reflect: source can't be determined: "
|
2455 |
|
|
"dst=%s, error=%d\n",
|
2456 |
|
|
ip6_sprintf(&sa6_src.sin6_addr), e));
|
2457 |
|
|
goto bad;
|
2458 |
|
|
}
|
2459 |
|
|
}
|
2460 |
|
|
|
2461 |
|
|
ip6->ip6_src = *src;
|
2462 |
|
|
|
2463 |
|
|
ip6->ip6_flow = 0;
|
2464 |
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
2465 |
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
2466 |
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
2467 |
|
|
if (m->m_pkthdr.rcvif) {
|
2468 |
|
|
/* XXX: This may not be the outgoing interface */
|
2469 |
|
|
ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
|
2470 |
|
|
} else
|
2471 |
|
|
ip6->ip6_hlim = ip6_defhlim;
|
2472 |
|
|
|
2473 |
|
|
icmp6->icmp6_cksum = 0;
|
2474 |
|
|
icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
|
2475 |
|
|
sizeof(struct ip6_hdr), plen);
|
2476 |
|
|
|
2477 |
|
|
/*
|
2478 |
|
|
* XXX option handling
|
2479 |
|
|
*/
|
2480 |
|
|
|
2481 |
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
2482 |
|
|
#ifdef IPSEC
|
2483 |
|
|
/* Don't lookup socket */
|
2484 |
|
|
(void)ipsec_setsocket(m, NULL);
|
2485 |
|
|
#endif /* IPSEC */
|
2486 |
|
|
|
2487 |
|
|
/*
|
2488 |
|
|
* To avoid a "too big" situation at an intermediate router
|
2489 |
|
|
* and the path MTU discovery process, specify the IPV6_MINMTU flag.
|
2490 |
|
|
* Note that only echo and node information replies are affected,
|
2491 |
|
|
* since the length of ICMP6 errors is limited to the minimum MTU.
|
2492 |
|
|
*/
|
2493 |
|
|
if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, &outif) != 0 && outif)
|
2494 |
|
|
icmp6_ifstat_inc(outif, ifs6_out_error);
|
2495 |
|
|
|
2496 |
|
|
if (outif)
|
2497 |
|
|
icmp6_ifoutstat_inc(outif, type, code);
|
2498 |
|
|
|
2499 |
|
|
return;
|
2500 |
|
|
|
2501 |
|
|
bad:
|
2502 |
|
|
m_freem(m);
|
2503 |
|
|
return;
|
2504 |
|
|
}
|
2505 |
|
|
|
2506 |
|
|
void
|
2507 |
|
|
icmp6_fasttimo()
|
2508 |
|
|
{
|
2509 |
|
|
|
2510 |
|
|
mld6_fasttimeo();
|
2511 |
|
|
}
|
2512 |
|
|
|
2513 |
|
|
static const char *
|
2514 |
|
|
icmp6_redirect_diag(src6, dst6, tgt6)
|
2515 |
|
|
struct in6_addr *src6;
|
2516 |
|
|
struct in6_addr *dst6;
|
2517 |
|
|
struct in6_addr *tgt6;
|
2518 |
|
|
{
|
2519 |
|
|
static char buf[1024];
|
2520 |
|
|
#ifndef __bsdi__
|
2521 |
|
|
snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
|
2522 |
|
|
ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
|
2523 |
|
|
#else
|
2524 |
|
|
sprintf(buf, "(src=%s dst=%s tgt=%s)",
|
2525 |
|
|
ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
|
2526 |
|
|
#endif
|
2527 |
|
|
return buf;
|
2528 |
|
|
}
|
2529 |
|
|
|
2530 |
|
|
void
|
2531 |
|
|
icmp6_redirect_input(m, off)
|
2532 |
|
|
struct mbuf *m;
|
2533 |
|
|
int off;
|
2534 |
|
|
{
|
2535 |
|
|
struct ifnet *ifp = m->m_pkthdr.rcvif;
|
2536 |
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
2537 |
|
|
struct nd_redirect *nd_rd;
|
2538 |
|
|
int icmp6len = ntohs(ip6->ip6_plen);
|
2539 |
|
|
char *lladdr = NULL;
|
2540 |
|
|
int lladdrlen = 0;
|
2541 |
|
|
u_char *redirhdr = NULL;
|
2542 |
|
|
int redirhdrlen = 0;
|
2543 |
|
|
struct rtentry *rt = NULL;
|
2544 |
|
|
int is_router;
|
2545 |
|
|
int is_onlink;
|
2546 |
|
|
struct in6_addr src6 = ip6->ip6_src;
|
2547 |
|
|
struct in6_addr redtgt6;
|
2548 |
|
|
struct in6_addr reddst6;
|
2549 |
|
|
union nd_opts ndopts;
|
2550 |
|
|
|
2551 |
|
|
if (!m || !ifp)
|
2552 |
|
|
return;
|
2553 |
|
|
|
2554 |
|
|
/* XXX if we are router, we don't update route by icmp6 redirect */
|
2555 |
|
|
if (ip6_forwarding)
|
2556 |
|
|
goto freeit;
|
2557 |
|
|
if (!icmp6_rediraccept)
|
2558 |
|
|
goto freeit;
|
2559 |
|
|
|
2560 |
|
|
#ifndef PULLDOWN_TEST
|
2561 |
|
|
IP6_EXTHDR_CHECK(m, off, icmp6len,);
|
2562 |
|
|
nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
|
2563 |
|
|
#else
|
2564 |
|
|
IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
|
2565 |
|
|
if (nd_rd == NULL) {
|
2566 |
|
|
icmp6stat.icp6s_tooshort++;
|
2567 |
|
|
return;
|
2568 |
|
|
}
|
2569 |
|
|
#endif
|
2570 |
|
|
redtgt6 = nd_rd->nd_rd_target;
|
2571 |
|
|
reddst6 = nd_rd->nd_rd_dst;
|
2572 |
|
|
|
2573 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
|
2574 |
|
|
redtgt6.s6_addr16[1] = htons(ifp->if_index);
|
2575 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
|
2576 |
|
|
reddst6.s6_addr16[1] = htons(ifp->if_index);
|
2577 |
|
|
|
2578 |
|
|
/* validation */
|
2579 |
|
|
if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
|
2580 |
|
|
nd6log((LOG_ERR,
|
2581 |
|
|
"ICMP6 redirect sent from %s rejected; "
|
2582 |
|
|
"must be from linklocal\n", ip6_sprintf(&src6)));
|
2583 |
|
|
goto bad;
|
2584 |
|
|
}
|
2585 |
|
|
if (ip6->ip6_hlim != 255) {
|
2586 |
|
|
nd6log((LOG_ERR,
|
2587 |
|
|
"ICMP6 redirect sent from %s rejected; "
|
2588 |
|
|
"hlim=%d (must be 255)\n",
|
2589 |
|
|
ip6_sprintf(&src6), ip6->ip6_hlim));
|
2590 |
|
|
goto bad;
|
2591 |
|
|
}
|
2592 |
|
|
{
|
2593 |
|
|
/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
|
2594 |
|
|
struct sockaddr_in6 sin6;
|
2595 |
|
|
struct in6_addr *gw6;
|
2596 |
|
|
|
2597 |
|
|
bzero(&sin6, sizeof(sin6));
|
2598 |
|
|
sin6.sin6_family = AF_INET6;
|
2599 |
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
2600 |
|
|
bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
|
2601 |
|
|
rt = rtalloc1((struct sockaddr *)&sin6, 0
|
2602 |
|
|
#ifdef __FreeBSD__
|
2603 |
|
|
, 0UL
|
2604 |
|
|
#endif
|
2605 |
|
|
);
|
2606 |
|
|
if (rt) {
|
2607 |
|
|
if (rt->rt_gateway == NULL ||
|
2608 |
|
|
rt->rt_gateway->sa_family != AF_INET6) {
|
2609 |
|
|
nd6log((LOG_ERR,
|
2610 |
|
|
"ICMP6 redirect rejected; no route "
|
2611 |
|
|
"with inet6 gateway found for redirect dst: %s\n",
|
2612 |
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
2613 |
|
|
RTFREE(rt);
|
2614 |
|
|
goto bad;
|
2615 |
|
|
}
|
2616 |
|
|
|
2617 |
|
|
gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
|
2618 |
|
|
if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
|
2619 |
|
|
nd6log((LOG_ERR,
|
2620 |
|
|
"ICMP6 redirect rejected; "
|
2621 |
|
|
"not equal to gw-for-src=%s (must be same): "
|
2622 |
|
|
"%s\n",
|
2623 |
|
|
ip6_sprintf(gw6),
|
2624 |
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
2625 |
|
|
RTFREE(rt);
|
2626 |
|
|
goto bad;
|
2627 |
|
|
}
|
2628 |
|
|
} else {
|
2629 |
|
|
nd6log((LOG_ERR,
|
2630 |
|
|
"ICMP6 redirect rejected; "
|
2631 |
|
|
"no route found for redirect dst: %s\n",
|
2632 |
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
2633 |
|
|
goto bad;
|
2634 |
|
|
}
|
2635 |
|
|
RTFREE(rt);
|
2636 |
|
|
rt = NULL;
|
2637 |
|
|
}
|
2638 |
|
|
if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
|
2639 |
|
|
nd6log((LOG_ERR,
|
2640 |
|
|
"ICMP6 redirect rejected; "
|
2641 |
|
|
"redirect dst must be unicast: %s\n",
|
2642 |
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
2643 |
|
|
goto bad;
|
2644 |
|
|
}
|
2645 |
|
|
|
2646 |
|
|
is_router = is_onlink = 0;
|
2647 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
|
2648 |
|
|
is_router = 1; /* router case */
|
2649 |
|
|
if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
|
2650 |
|
|
is_onlink = 1; /* on-link destination case */
|
2651 |
|
|
if (!is_router && !is_onlink) {
|
2652 |
|
|
nd6log((LOG_ERR,
|
2653 |
|
|
"ICMP6 redirect rejected; "
|
2654 |
|
|
"neither router case nor onlink case: %s\n",
|
2655 |
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
2656 |
|
|
goto bad;
|
2657 |
|
|
}
|
2658 |
|
|
/* validation passed */
|
2659 |
|
|
|
2660 |
|
|
icmp6len -= sizeof(*nd_rd);
|
2661 |
|
|
nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
|
2662 |
|
|
if (nd6_options(&ndopts) < 0) {
|
2663 |
|
|
nd6log((LOG_INFO, "icmp6_redirect_input: "
|
2664 |
|
|
"invalid ND option, rejected: %s\n",
|
2665 |
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
2666 |
|
|
/* nd6_options have incremented stats */
|
2667 |
|
|
goto freeit;
|
2668 |
|
|
}
|
2669 |
|
|
|
2670 |
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
2671 |
|
|
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
|
2672 |
|
|
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
|
2673 |
|
|
}
|
2674 |
|
|
|
2675 |
|
|
if (ndopts.nd_opts_rh) {
|
2676 |
|
|
redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
|
2677 |
|
|
redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
|
2678 |
|
|
}
|
2679 |
|
|
|
2680 |
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
|
2681 |
|
|
nd6log((LOG_INFO,
|
2682 |
|
|
"icmp6_redirect_input: lladdrlen mismatch for %s "
|
2683 |
|
|
"(if %d, icmp6 packet %d): %s\n",
|
2684 |
|
|
ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
|
2685 |
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
2686 |
|
|
goto bad;
|
2687 |
|
|
}
|
2688 |
|
|
|
2689 |
|
|
/* RFC 2461 8.3 */
|
2690 |
|
|
nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
|
2691 |
|
|
is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
|
2692 |
|
|
|
2693 |
|
|
if (!is_onlink) { /* better router case. perform rtredirect. */
|
2694 |
|
|
/* perform rtredirect */
|
2695 |
|
|
struct sockaddr_in6 sdst;
|
2696 |
|
|
struct sockaddr_in6 sgw;
|
2697 |
|
|
struct sockaddr_in6 ssrc;
|
2698 |
|
|
#ifdef __bsdi__
|
2699 |
|
|
extern int icmp_redirtimeout; /* XXX */
|
2700 |
|
|
#endif
|
2701 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
2702 |
|
|
unsigned long rtcount;
|
2703 |
|
|
struct rtentry *newrt = NULL;
|
2704 |
|
|
#endif
|
2705 |
|
|
|
2706 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
2707 |
|
|
/*
|
2708 |
|
|
* do not install redirect route, if the number of entries
|
2709 |
|
|
* is too much (> hiwat). note that, the node (= host) will
|
2710 |
|
|
* work just fine even if we do not install redirect route
|
2711 |
|
|
* (there will be additional hops, though).
|
2712 |
|
|
*/
|
2713 |
|
|
rtcount = rt_timer_count(icmp6_redirect_timeout_q);
|
2714 |
|
|
if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat)
|
2715 |
|
|
return;
|
2716 |
|
|
else if (0 <= icmp6_redirect_lowat &&
|
2717 |
|
|
rtcount > icmp6_redirect_lowat) {
|
2718 |
|
|
/*
|
2719 |
|
|
* XXX nuke a victim, install the new one.
|
2720 |
|
|
*/
|
2721 |
|
|
}
|
2722 |
|
|
#endif
|
2723 |
|
|
|
2724 |
|
|
bzero(&sdst, sizeof(sdst));
|
2725 |
|
|
bzero(&sgw, sizeof(sgw));
|
2726 |
|
|
bzero(&ssrc, sizeof(ssrc));
|
2727 |
|
|
sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
|
2728 |
|
|
sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
|
2729 |
|
|
sizeof(struct sockaddr_in6);
|
2730 |
|
|
bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
|
2731 |
|
|
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
|
2732 |
|
|
bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
|
2733 |
|
|
rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
|
2734 |
|
|
(struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
|
2735 |
|
|
(struct sockaddr *)&ssrc,
|
2736 |
|
|
#ifdef __bsdi__
|
2737 |
|
|
icmp_redirtimeout
|
2738 |
|
|
#elif defined(__NetBSD__) || defined(__OpenBSD__)
|
2739 |
|
|
&newrt
|
2740 |
|
|
#else
|
2741 |
|
|
(struct rtentry **)NULL
|
2742 |
|
|
#endif
|
2743 |
|
|
);
|
2744 |
|
|
|
2745 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
2746 |
|
|
if (newrt) {
|
2747 |
|
|
(void)rt_timer_add(newrt, icmp6_redirect_timeout,
|
2748 |
|
|
icmp6_redirect_timeout_q);
|
2749 |
|
|
rtfree(newrt);
|
2750 |
|
|
}
|
2751 |
|
|
#endif
|
2752 |
|
|
}
|
2753 |
|
|
/* finally update cached route in each socket via pfctlinput */
|
2754 |
|
|
{
|
2755 |
|
|
struct sockaddr_in6 sdst;
|
2756 |
|
|
|
2757 |
|
|
bzero(&sdst, sizeof(sdst));
|
2758 |
|
|
sdst.sin6_family = AF_INET6;
|
2759 |
|
|
sdst.sin6_len = sizeof(struct sockaddr_in6);
|
2760 |
|
|
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
|
2761 |
|
|
pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
|
2762 |
|
|
#ifdef IPSEC
|
2763 |
|
|
key_sa_routechange((struct sockaddr *)&sdst);
|
2764 |
|
|
#endif
|
2765 |
|
|
}
|
2766 |
|
|
|
2767 |
|
|
freeit:
|
2768 |
|
|
m_freem(m);
|
2769 |
|
|
return;
|
2770 |
|
|
|
2771 |
|
|
bad:
|
2772 |
|
|
icmp6stat.icp6s_badredirect++;
|
2773 |
|
|
m_freem(m);
|
2774 |
|
|
}
|
2775 |
|
|
|
2776 |
|
|
void
|
2777 |
|
|
icmp6_redirect_output(m0, rt)
|
2778 |
|
|
struct mbuf *m0;
|
2779 |
|
|
struct rtentry *rt;
|
2780 |
|
|
{
|
2781 |
|
|
struct ifnet *ifp; /* my outgoing interface */
|
2782 |
|
|
struct in6_addr *ifp_ll6;
|
2783 |
|
|
struct in6_addr *router_ll6;
|
2784 |
|
|
struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
|
2785 |
|
|
struct mbuf *m = NULL; /* newly allocated one */
|
2786 |
|
|
struct ip6_hdr *ip6; /* m as struct ip6_hdr */
|
2787 |
|
|
struct nd_redirect *nd_rd;
|
2788 |
|
|
size_t maxlen;
|
2789 |
|
|
u_char *p;
|
2790 |
|
|
struct sockaddr_in6 src_sa;
|
2791 |
|
|
int64_t zoneid;
|
2792 |
|
|
|
2793 |
|
|
icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
|
2794 |
|
|
|
2795 |
|
|
/* if we are not router, we don't send icmp6 redirect */
|
2796 |
|
|
if (!ip6_forwarding || ip6_accept_rtadv)
|
2797 |
|
|
goto fail;
|
2798 |
|
|
|
2799 |
|
|
/* sanity check */
|
2800 |
|
|
if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
|
2801 |
|
|
goto fail;
|
2802 |
|
|
|
2803 |
|
|
/*
|
2804 |
|
|
* Address check:
|
2805 |
|
|
* the source address must identify a neighbor, and
|
2806 |
|
|
* the destination address must not be a multicast address
|
2807 |
|
|
* [RFC 2461, sec 8.2]
|
2808 |
|
|
*/
|
2809 |
|
|
sip6 = mtod(m0, struct ip6_hdr *);
|
2810 |
|
|
bzero(&src_sa, sizeof(src_sa));
|
2811 |
|
|
src_sa.sin6_family = AF_INET6;
|
2812 |
|
|
src_sa.sin6_len = sizeof(src_sa);
|
2813 |
|
|
src_sa.sin6_addr = sip6->ip6_src;
|
2814 |
|
|
/* we don't currently use sin6_scope_id, but eventually use it */
|
2815 |
|
|
if ((zoneid = in6_addr2zoneid(ifp, &sip6->ip6_src)) < 0)
|
2816 |
|
|
goto fail;
|
2817 |
|
|
src_sa.sin6_scope_id = zoneid;
|
2818 |
|
|
if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
|
2819 |
|
|
goto fail;
|
2820 |
|
|
if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
|
2821 |
|
|
goto fail; /* what should we do here? */
|
2822 |
|
|
|
2823 |
|
|
/* rate limit */
|
2824 |
|
|
if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
|
2825 |
|
|
goto fail;
|
2826 |
|
|
|
2827 |
|
|
/*
|
2828 |
|
|
* Since we are going to append up to 1280 bytes (= IPV6_MMTU),
|
2829 |
|
|
* we almost always ask for an mbuf cluster for simplicity.
|
2830 |
|
|
* (MHLEN < IPV6_MMTU is almost always true)
|
2831 |
|
|
*/
|
2832 |
|
|
#if IPV6_MMTU >= MCLBYTES
|
2833 |
|
|
# error assumption failed about IPV6_MMTU and MCLBYTES
|
2834 |
|
|
#endif
|
2835 |
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
2836 |
|
|
if (m && IPV6_MMTU >= MHLEN)
|
2837 |
|
|
MCLGET(m, M_DONTWAIT);
|
2838 |
|
|
if (!m)
|
2839 |
|
|
goto fail;
|
2840 |
|
|
m->m_pkthdr.rcvif = NULL;
|
2841 |
|
|
m->m_len = 0;
|
2842 |
|
|
maxlen = M_TRAILINGSPACE(m);
|
2843 |
|
|
maxlen = min(IPV6_MMTU, maxlen);
|
2844 |
|
|
/* just for safety */
|
2845 |
|
|
if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
|
2846 |
|
|
((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
|
2847 |
|
|
goto fail;
|
2848 |
|
|
}
|
2849 |
|
|
|
2850 |
|
|
{
|
2851 |
|
|
/* get ip6 linklocal address for ifp(my outgoing interface). */
|
2852 |
|
|
struct in6_ifaddr *ia;
|
2853 |
|
|
if ((ia = in6ifa_ifpforlinklocal(ifp,
|
2854 |
|
|
IN6_IFF_NOTREADY|
|
2855 |
|
|
IN6_IFF_ANYCAST)) == NULL)
|
2856 |
|
|
goto fail;
|
2857 |
|
|
ifp_ll6 = &ia->ia_addr.sin6_addr;
|
2858 |
|
|
}
|
2859 |
|
|
|
2860 |
|
|
/* get ip6 linklocal address for the router. */
|
2861 |
|
|
if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
|
2862 |
|
|
struct sockaddr_in6 *sin6;
|
2863 |
|
|
sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
|
2864 |
|
|
router_ll6 = &sin6->sin6_addr;
|
2865 |
|
|
if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
|
2866 |
|
|
router_ll6 = (struct in6_addr *)NULL;
|
2867 |
|
|
} else
|
2868 |
|
|
router_ll6 = (struct in6_addr *)NULL;
|
2869 |
|
|
|
2870 |
|
|
/* ip6 */
|
2871 |
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
2872 |
|
|
ip6->ip6_flow = 0;
|
2873 |
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
2874 |
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
2875 |
|
|
/* ip6->ip6_plen will be set later */
|
2876 |
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
2877 |
|
|
ip6->ip6_hlim = 255;
|
2878 |
|
|
/* ip6->ip6_src must be linklocal addr for my outgoing if. */
|
2879 |
|
|
bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
|
2880 |
|
|
bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
|
2881 |
|
|
|
2882 |
|
|
/* ND Redirect */
|
2883 |
|
|
nd_rd = (struct nd_redirect *)(ip6 + 1);
|
2884 |
|
|
nd_rd->nd_rd_type = ND_REDIRECT;
|
2885 |
|
|
nd_rd->nd_rd_code = 0;
|
2886 |
|
|
nd_rd->nd_rd_reserved = 0;
|
2887 |
|
|
if (rt->rt_flags & RTF_GATEWAY) {
|
2888 |
|
|
/*
|
2889 |
|
|
* nd_rd->nd_rd_target must be a link-local address in
|
2890 |
|
|
* better router cases.
|
2891 |
|
|
*/
|
2892 |
|
|
if (!router_ll6)
|
2893 |
|
|
goto fail;
|
2894 |
|
|
bcopy(router_ll6, &nd_rd->nd_rd_target,
|
2895 |
|
|
sizeof(nd_rd->nd_rd_target));
|
2896 |
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
|
2897 |
|
|
sizeof(nd_rd->nd_rd_dst));
|
2898 |
|
|
} else {
|
2899 |
|
|
/* make sure redtgt == reddst */
|
2900 |
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
|
2901 |
|
|
sizeof(nd_rd->nd_rd_target));
|
2902 |
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
|
2903 |
|
|
sizeof(nd_rd->nd_rd_dst));
|
2904 |
|
|
}
|
2905 |
|
|
|
2906 |
|
|
p = (u_char *)(nd_rd + 1);
|
2907 |
|
|
|
2908 |
|
|
if (!router_ll6)
|
2909 |
|
|
goto nolladdropt;
|
2910 |
|
|
|
2911 |
|
|
{
|
2912 |
|
|
/* target lladdr option */
|
2913 |
|
|
struct rtentry *rt_router = NULL;
|
2914 |
|
|
int len;
|
2915 |
|
|
struct sockaddr_dl *sdl;
|
2916 |
|
|
struct nd_opt_hdr *nd_opt;
|
2917 |
|
|
char *lladdr;
|
2918 |
|
|
|
2919 |
|
|
rt_router = nd6_lookup(router_ll6, 0, ifp);
|
2920 |
|
|
if (!rt_router)
|
2921 |
|
|
goto nolladdropt;
|
2922 |
|
|
len = sizeof(*nd_opt) + ifp->if_addrlen;
|
2923 |
|
|
len = (len + 7) & ~7; /* round by 8 */
|
2924 |
|
|
/* safety check */
|
2925 |
|
|
if (len + (p - (u_char *)ip6) > maxlen)
|
2926 |
|
|
goto nolladdropt;
|
2927 |
|
|
if (!(rt_router->rt_flags & RTF_GATEWAY) &&
|
2928 |
|
|
(rt_router->rt_flags & RTF_LLINFO) &&
|
2929 |
|
|
(rt_router->rt_gateway->sa_family == AF_LINK) &&
|
2930 |
|
|
(sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
|
2931 |
|
|
sdl->sdl_alen) {
|
2932 |
|
|
nd_opt = (struct nd_opt_hdr *)p;
|
2933 |
|
|
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
|
2934 |
|
|
nd_opt->nd_opt_len = len >> 3;
|
2935 |
|
|
lladdr = (char *)(nd_opt + 1);
|
2936 |
|
|
bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
|
2937 |
|
|
p += len;
|
2938 |
|
|
}
|
2939 |
|
|
}
|
2940 |
|
|
nolladdropt:;
|
2941 |
|
|
|
2942 |
|
|
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
|
2943 |
|
|
|
2944 |
|
|
/* just to be safe */
|
2945 |
|
|
#ifdef M_DECRYPTED /* not openbsd */
|
2946 |
|
|
if (m0->m_flags & M_DECRYPTED)
|
2947 |
|
|
goto noredhdropt;
|
2948 |
|
|
#endif
|
2949 |
|
|
if (p - (u_char *)ip6 > maxlen)
|
2950 |
|
|
goto noredhdropt;
|
2951 |
|
|
|
2952 |
|
|
{
|
2953 |
|
|
/* redirected header option */
|
2954 |
|
|
int len;
|
2955 |
|
|
struct nd_opt_rd_hdr *nd_opt_rh;
|
2956 |
|
|
|
2957 |
|
|
/*
|
2958 |
|
|
* compute the maximum size for icmp6 redirect header option.
|
2959 |
|
|
* XXX room for auth header?
|
2960 |
|
|
*/
|
2961 |
|
|
len = maxlen - (p - (u_char *)ip6);
|
2962 |
|
|
len &= ~7;
|
2963 |
|
|
|
2964 |
|
|
/* This is just for simplicity. */
|
2965 |
|
|
if (m0->m_pkthdr.len != m0->m_len) {
|
2966 |
|
|
if (m0->m_next) {
|
2967 |
|
|
m_freem(m0->m_next);
|
2968 |
|
|
m0->m_next = NULL;
|
2969 |
|
|
}
|
2970 |
|
|
m0->m_pkthdr.len = m0->m_len;
|
2971 |
|
|
}
|
2972 |
|
|
|
2973 |
|
|
/*
|
2974 |
|
|
* Redirected header option spec (RFC2461 4.6.3) talks nothing
|
2975 |
|
|
* about padding/truncate rule for the original IP packet.
|
2976 |
|
|
* From the discussion on IPv6imp in Feb 1999, the consensus was:
|
2977 |
|
|
* - "attach as much as possible" is the goal
|
2978 |
|
|
* - pad if not aligned (original size can be guessed by original
|
2979 |
|
|
* ip6 header)
|
2980 |
|
|
* Following code adds the padding if it is simple enough,
|
2981 |
|
|
* and truncates if not.
|
2982 |
|
|
*/
|
2983 |
|
|
if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
|
2984 |
|
|
panic("assumption failed in %s:%d\n", __FILE__, __LINE__);
|
2985 |
|
|
|
2986 |
|
|
if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
|
2987 |
|
|
/* not enough room, truncate */
|
2988 |
|
|
m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
|
2989 |
|
|
} else {
|
2990 |
|
|
/* enough room, pad or truncate */
|
2991 |
|
|
size_t extra;
|
2992 |
|
|
|
2993 |
|
|
extra = m0->m_pkthdr.len % 8;
|
2994 |
|
|
if (extra) {
|
2995 |
|
|
/* pad if easy enough, truncate if not */
|
2996 |
|
|
if (8 - extra <= M_TRAILINGSPACE(m0)) {
|
2997 |
|
|
/* pad */
|
2998 |
|
|
m0->m_len += (8 - extra);
|
2999 |
|
|
m0->m_pkthdr.len += (8 - extra);
|
3000 |
|
|
} else {
|
3001 |
|
|
/* truncate */
|
3002 |
|
|
m0->m_pkthdr.len -= extra;
|
3003 |
|
|
m0->m_len -= extra;
|
3004 |
|
|
}
|
3005 |
|
|
}
|
3006 |
|
|
len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
|
3007 |
|
|
m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
|
3008 |
|
|
}
|
3009 |
|
|
|
3010 |
|
|
nd_opt_rh = (struct nd_opt_rd_hdr *)p;
|
3011 |
|
|
bzero(nd_opt_rh, sizeof(*nd_opt_rh));
|
3012 |
|
|
nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
|
3013 |
|
|
nd_opt_rh->nd_opt_rh_len = len >> 3;
|
3014 |
|
|
p += sizeof(*nd_opt_rh);
|
3015 |
|
|
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
|
3016 |
|
|
|
3017 |
|
|
/* connect m0 to m */
|
3018 |
|
|
m->m_next = m0;
|
3019 |
|
|
m->m_pkthdr.len = m->m_len + m0->m_len;
|
3020 |
|
|
}
|
3021 |
|
|
noredhdropt:;
|
3022 |
|
|
|
3023 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
|
3024 |
|
|
sip6->ip6_src.s6_addr16[1] = 0;
|
3025 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
|
3026 |
|
|
sip6->ip6_dst.s6_addr16[1] = 0;
|
3027 |
|
|
#if 0
|
3028 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
|
3029 |
|
|
ip6->ip6_src.s6_addr16[1] = 0;
|
3030 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
|
3031 |
|
|
ip6->ip6_dst.s6_addr16[1] = 0;
|
3032 |
|
|
#endif
|
3033 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
|
3034 |
|
|
nd_rd->nd_rd_target.s6_addr16[1] = 0;
|
3035 |
|
|
if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
|
3036 |
|
|
nd_rd->nd_rd_dst.s6_addr16[1] = 0;
|
3037 |
|
|
|
3038 |
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
3039 |
|
|
|
3040 |
|
|
nd_rd->nd_rd_cksum = 0;
|
3041 |
|
|
nd_rd->nd_rd_cksum
|
3042 |
|
|
= in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
|
3043 |
|
|
|
3044 |
|
|
/* send the packet to outside... */
|
3045 |
|
|
#ifdef IPSEC
|
3046 |
|
|
/* Don't lookup socket */
|
3047 |
|
|
(void)ipsec_setsocket(m, NULL);
|
3048 |
|
|
#endif /* IPSEC */
|
3049 |
|
|
if (ip6_output(m, NULL, NULL, 0, NULL, NULL) != 0)
|
3050 |
|
|
icmp6_ifstat_inc(ifp, ifs6_out_error);
|
3051 |
|
|
|
3052 |
|
|
icmp6_ifstat_inc(ifp, ifs6_out_msg);
|
3053 |
|
|
icmp6_ifstat_inc(ifp, ifs6_out_redirect);
|
3054 |
|
|
icmp6stat.icp6s_outhist[ND_REDIRECT]++;
|
3055 |
|
|
|
3056 |
|
|
return;
|
3057 |
|
|
|
3058 |
|
|
fail:
|
3059 |
|
|
if (m)
|
3060 |
|
|
m_freem(m);
|
3061 |
|
|
if (m0)
|
3062 |
|
|
m_freem(m0);
|
3063 |
|
|
}
|
3064 |
|
|
|
3065 |
|
|
#ifdef HAVE_NRL_INPCB
|
3066 |
|
|
#define sotoin6pcb sotoinpcb
|
3067 |
|
|
#define in6pcb inpcb
|
3068 |
|
|
#define in6p_icmp6filt inp_icmp6filt
|
3069 |
|
|
#endif
|
3070 |
|
|
/*
|
3071 |
|
|
* ICMPv6 socket option processing.
|
3072 |
|
|
*/
|
3073 |
|
|
int
|
3074 |
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
3075 |
|
|
icmp6_ctloutput(so, sopt)
|
3076 |
|
|
struct socket *so;
|
3077 |
|
|
struct sockopt *sopt;
|
3078 |
|
|
#else
|
3079 |
|
|
icmp6_ctloutput(op, so, level, optname, mp)
|
3080 |
|
|
int op;
|
3081 |
|
|
struct socket *so;
|
3082 |
|
|
int level, optname;
|
3083 |
|
|
struct mbuf **mp;
|
3084 |
|
|
#endif
|
3085 |
|
|
{
|
3086 |
|
|
int error = 0;
|
3087 |
|
|
int optlen;
|
3088 |
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
3089 |
|
|
struct inpcb *inp = sotoinpcb(so);
|
3090 |
|
|
int level, op, optname;
|
3091 |
|
|
|
3092 |
|
|
if (sopt) {
|
3093 |
|
|
level = sopt->sopt_level;
|
3094 |
|
|
op = sopt->sopt_dir;
|
3095 |
|
|
optname = sopt->sopt_name;
|
3096 |
|
|
optlen = sopt->sopt_valsize;
|
3097 |
|
|
} else
|
3098 |
|
|
level = op = optname = optlen = 0;
|
3099 |
|
|
#else
|
3100 |
|
|
struct in6pcb *in6p = sotoin6pcb(so);
|
3101 |
|
|
struct mbuf *m = *mp;
|
3102 |
|
|
|
3103 |
|
|
optlen = m ? m->m_len : 0;
|
3104 |
|
|
#endif
|
3105 |
|
|
|
3106 |
|
|
if (level != IPPROTO_ICMPV6) {
|
3107 |
|
|
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
|
3108 |
|
|
if (op == PRCO_SETOPT && m)
|
3109 |
|
|
(void)m_free(m);
|
3110 |
|
|
#endif
|
3111 |
|
|
return EINVAL;
|
3112 |
|
|
}
|
3113 |
|
|
|
3114 |
|
|
switch (op) {
|
3115 |
|
|
case PRCO_SETOPT:
|
3116 |
|
|
switch (optname) {
|
3117 |
|
|
case ICMP6_FILTER:
|
3118 |
|
|
{
|
3119 |
|
|
struct icmp6_filter *p;
|
3120 |
|
|
|
3121 |
|
|
if (optlen != sizeof(*p)) {
|
3122 |
|
|
error = EMSGSIZE;
|
3123 |
|
|
break;
|
3124 |
|
|
}
|
3125 |
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
3126 |
|
|
if (inp->in6p_icmp6filt == NULL) {
|
3127 |
|
|
error = EINVAL;
|
3128 |
|
|
break;
|
3129 |
|
|
}
|
3130 |
|
|
error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
|
3131 |
|
|
optlen);
|
3132 |
|
|
#else
|
3133 |
|
|
p = mtod(m, struct icmp6_filter *);
|
3134 |
|
|
if (!p || !in6p->in6p_icmp6filt) {
|
3135 |
|
|
error = EINVAL;
|
3136 |
|
|
break;
|
3137 |
|
|
}
|
3138 |
|
|
bcopy(p, in6p->in6p_icmp6filt,
|
3139 |
|
|
sizeof(struct icmp6_filter));
|
3140 |
|
|
error = 0;
|
3141 |
|
|
#endif
|
3142 |
|
|
break;
|
3143 |
|
|
}
|
3144 |
|
|
|
3145 |
|
|
default:
|
3146 |
|
|
error = ENOPROTOOPT;
|
3147 |
|
|
break;
|
3148 |
|
|
}
|
3149 |
|
|
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
|
3150 |
|
|
if (m)
|
3151 |
|
|
(void)m_freem(m);
|
3152 |
|
|
#endif
|
3153 |
|
|
break;
|
3154 |
|
|
|
3155 |
|
|
case PRCO_GETOPT:
|
3156 |
|
|
switch (optname) {
|
3157 |
|
|
case ICMP6_FILTER:
|
3158 |
|
|
{
|
3159 |
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
3160 |
|
|
if (inp->in6p_icmp6filt == NULL) {
|
3161 |
|
|
error = EINVAL;
|
3162 |
|
|
break;
|
3163 |
|
|
}
|
3164 |
|
|
error = sooptcopyout(sopt, inp->in6p_icmp6filt,
|
3165 |
|
|
sizeof(struct icmp6_filter));
|
3166 |
|
|
#else
|
3167 |
|
|
struct icmp6_filter *p;
|
3168 |
|
|
|
3169 |
|
|
if (!in6p->in6p_icmp6filt) {
|
3170 |
|
|
error = EINVAL;
|
3171 |
|
|
break;
|
3172 |
|
|
}
|
3173 |
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
3174 |
|
|
m->m_len = sizeof(struct icmp6_filter);
|
3175 |
|
|
p = mtod(m, struct icmp6_filter *);
|
3176 |
|
|
bcopy(in6p->in6p_icmp6filt, p,
|
3177 |
|
|
sizeof(struct icmp6_filter));
|
3178 |
|
|
error = 0;
|
3179 |
|
|
#endif
|
3180 |
|
|
break;
|
3181 |
|
|
}
|
3182 |
|
|
|
3183 |
|
|
default:
|
3184 |
|
|
error = ENOPROTOOPT;
|
3185 |
|
|
break;
|
3186 |
|
|
}
|
3187 |
|
|
break;
|
3188 |
|
|
}
|
3189 |
|
|
|
3190 |
|
|
return(error);
|
3191 |
|
|
}
|
3192 |
|
|
#ifdef HAVE_NRL_INPCB
|
3193 |
|
|
#undef sotoin6pcb
|
3194 |
|
|
#undef in6pcb
|
3195 |
|
|
#undef in6p_icmp6filt
|
3196 |
|
|
#endif
|
3197 |
|
|
|
3198 |
|
|
#ifndef HAVE_PPSRATECHECK
|
3199 |
|
|
#ifndef timersub
|
3200 |
|
|
#define timersub(tvp, uvp, vvp) \
|
3201 |
|
|
do { \
|
3202 |
|
|
(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
|
3203 |
|
|
(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
|
3204 |
|
|
if ((vvp)->tv_usec < 0) { \
|
3205 |
|
|
(vvp)->tv_sec--; \
|
3206 |
|
|
(vvp)->tv_usec += 1000000; \
|
3207 |
|
|
} \
|
3208 |
|
|
} while (0)
|
3209 |
|
|
#endif
|
3210 |
|
|
|
3211 |
|
|
/*
|
3212 |
|
|
* ppsratecheck(): packets (or events) per second limitation.
|
3213 |
|
|
*/
|
3214 |
|
|
static int
|
3215 |
|
|
ppsratecheck(lasttime, curpps, maxpps)
|
3216 |
|
|
struct timeval *lasttime;
|
3217 |
|
|
int *curpps;
|
3218 |
|
|
int maxpps; /* maximum pps allowed */
|
3219 |
|
|
{
|
3220 |
|
|
struct timeval tv, delta;
|
3221 |
|
|
int s, rv;
|
3222 |
|
|
|
3223 |
|
|
s = splclock();
|
3224 |
|
|
#ifndef __FreeBSD__
|
3225 |
|
|
tv = mono_time;
|
3226 |
|
|
#else
|
3227 |
|
|
microtime(&tv);
|
3228 |
|
|
#endif
|
3229 |
|
|
splx(s);
|
3230 |
|
|
|
3231 |
|
|
timersub(&tv, lasttime, &delta);
|
3232 |
|
|
|
3233 |
|
|
/*
|
3234 |
|
|
* Check for 0,0 so that the message will be seen at least once.
|
3235 |
|
|
* If more than one second has passed since the last update of
|
3236 |
|
|
* lasttime, reset the counter.
|
3237 |
|
|
*
|
3238 |
|
|
* We do increment *curpps even in *curpps < maxpps case, as some may
|
3239 |
|
|
* try to use *curpps for stat purposes as well.
|
3240 |
|
|
*/
|
3241 |
|
|
if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
|
3242 |
|
|
delta.tv_sec >= 1) {
|
3243 |
|
|
*lasttime = tv;
|
3244 |
|
|
*curpps = 0;
|
3245 |
|
|
rv = 1;
|
3246 |
|
|
} else if (maxpps < 0)
|
3247 |
|
|
rv = 1;
|
3248 |
|
|
else if (*curpps < maxpps)
|
3249 |
|
|
rv = 1;
|
3250 |
|
|
else
|
3251 |
|
|
rv = 0;
|
3252 |
|
|
|
3253 |
|
|
#if 1 /* DIAGNOSTIC? */
|
3254 |
|
|
/* be careful about wrap-around */
|
3255 |
|
|
if (*curpps + 1 > *curpps)
|
3256 |
|
|
*curpps = *curpps + 1;
|
3257 |
|
|
#else
|
3258 |
|
|
/*
|
3259 |
|
|
* assume that there's not too many calls to this function.
|
3260 |
|
|
* not sure if the assumption holds, as it depends on *caller's*
|
3261 |
|
|
* behavior, not the behavior of this function.
|
3262 |
|
|
* IMHO it is wrong to make assumption on the caller's behavior,
|
3263 |
|
|
* so the above #if is #if 1, not #ifdef DIAGNOSTIC.
|
3264 |
|
|
*/
|
3265 |
|
|
*curpps = *curpps + 1;
|
3266 |
|
|
#endif
|
3267 |
|
|
|
3268 |
|
|
return (rv);
|
3269 |
|
|
}
|
3270 |
|
|
#endif
|
3271 |
|
|
|
3272 |
|
|
/*
|
3273 |
|
|
* Perform rate limit check.
|
3274 |
|
|
* Returns 0 if it is okay to send the icmp6 packet.
|
3275 |
|
|
* Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
|
3276 |
|
|
* limitation.
|
3277 |
|
|
*
|
3278 |
|
|
* XXX per-destination/type check necessary?
|
3279 |
|
|
*/
|
3280 |
|
|
static int
|
3281 |
|
|
icmp6_ratelimit(dst, type, code)
|
3282 |
|
|
const struct in6_addr *dst; /* not used at this moment */
|
3283 |
|
|
const int type; /* not used at this moment */
|
3284 |
|
|
const int code; /* not used at this moment */
|
3285 |
|
|
{
|
3286 |
|
|
int ret;
|
3287 |
|
|
|
3288 |
|
|
ret = 0; /* okay to send */
|
3289 |
|
|
|
3290 |
|
|
/* PPS limit */
|
3291 |
|
|
if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
|
3292 |
|
|
icmp6errppslim)) {
|
3293 |
|
|
/* The packet is subject to rate limit */
|
3294 |
|
|
ret++;
|
3295 |
|
|
}
|
3296 |
|
|
|
3297 |
|
|
return ret;
|
3298 |
|
|
}
|
3299 |
|
|
|
3300 |
|
|
/*
|
3301 |
|
|
* Swap ip6_src and the address in the homeaddress destination option.
|
3302 |
|
|
* Since the dest6 processing routine swaps ip6_src and homeaddr (if
|
3303 |
|
|
* any), we must swap them again when we send back the ip datagram to
|
3304 |
|
|
* the sender (ex. icmp6_error).
|
3305 |
|
|
*
|
3306 |
|
|
* returns 0 if succeeded.
|
3307 |
|
|
*/
|
3308 |
|
|
static int
|
3309 |
|
|
icmp6_recover_src(m)
|
3310 |
|
|
struct mbuf *m; /* original ip6 packet */
|
3311 |
|
|
{
|
3312 |
|
|
int off, nxt, finished = 0;
|
3313 |
|
|
struct ip6_hdr *oip6;
|
3314 |
|
|
struct ip6_ext *exts;
|
3315 |
|
|
struct ip6_dest *dstopts;
|
3316 |
|
|
int dstoptlen;
|
3317 |
|
|
u_int8_t *opt;
|
3318 |
|
|
int optlen;
|
3319 |
|
|
struct ip6_opt_home_address *haopt;
|
3320 |
|
|
struct in6_addr t;
|
3321 |
|
|
int error = 0;
|
3322 |
|
|
|
3323 |
|
|
#ifndef PULLDOWN_TEST
|
3324 |
|
|
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ENOBUFS);
|
3325 |
|
|
oip6 = mtod(m, struct ip6_hdr *);
|
3326 |
|
|
#else
|
3327 |
|
|
IP6_EXTHDR_GET(oip6, struct ip6_hdr *, m, 0, sizeof(*oip6));
|
3328 |
|
|
if (oip6 == NULL) {
|
3329 |
|
|
error = ENOBUFS;
|
3330 |
|
|
goto bad;
|
3331 |
|
|
}
|
3332 |
|
|
#endif
|
3333 |
|
|
|
3334 |
|
|
off = sizeof(struct ip6_hdr);
|
3335 |
|
|
nxt = oip6->ip6_nxt;
|
3336 |
|
|
while (off + 2 < m->m_pkthdr.len) {
|
3337 |
|
|
switch (nxt) {
|
3338 |
|
|
case IPPROTO_DSTOPTS:
|
3339 |
|
|
#ifndef PULLDOWN_TEST
|
3340 |
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(struct ip6_dest),
|
3341 |
|
|
ENOBUFS);
|
3342 |
|
|
dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
|
3343 |
|
|
#else
|
3344 |
|
|
IP6_EXTHDR_GET(dstopts, struct ip6_dest *,
|
3345 |
|
|
m, off, sizeof(*dstopts));
|
3346 |
|
|
if (dstopts == NULL) {
|
3347 |
|
|
error = ENOBUFS;
|
3348 |
|
|
goto bad;
|
3349 |
|
|
}
|
3350 |
|
|
#endif
|
3351 |
|
|
|
3352 |
|
|
dstoptlen = (dstopts->ip6d_len + 1) << 3;
|
3353 |
|
|
#ifndef PULLDOWN_TEST
|
3354 |
|
|
IP6_EXTHDR_CHECK(m, off, dstoptlen, ENOBUFS);
|
3355 |
|
|
dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
|
3356 |
|
|
#else
|
3357 |
|
|
IP6_EXTHDR_GET(dstopts, struct ip6_dest *,
|
3358 |
|
|
m, off, dstoptlen);
|
3359 |
|
|
if (dstopts == NULL) {
|
3360 |
|
|
error = ENOBUFS;
|
3361 |
|
|
goto bad;
|
3362 |
|
|
}
|
3363 |
|
|
#endif
|
3364 |
|
|
off += dstoptlen;
|
3365 |
|
|
nxt = dstopts->ip6d_nxt;
|
3366 |
|
|
|
3367 |
|
|
/* find homeaddress dstopt */
|
3368 |
|
|
dstoptlen -= sizeof(struct ip6_dest);
|
3369 |
|
|
opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
|
3370 |
|
|
for (optlen = 0; (dstoptlen > 0 && finished == 0);
|
3371 |
|
|
dstoptlen -= optlen, opt += optlen) {
|
3372 |
|
|
if ((*opt != IP6OPT_PAD1) &&
|
3373 |
|
|
(dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
|
3374 |
|
|
error = EINVAL;
|
3375 |
|
|
goto bad;
|
3376 |
|
|
}
|
3377 |
|
|
switch (*opt) {
|
3378 |
|
|
case IP6OPT_PAD1:
|
3379 |
|
|
optlen = 1;
|
3380 |
|
|
break;
|
3381 |
|
|
case IP6OPT_PADN:
|
3382 |
|
|
optlen = *(opt + 1) + 2;
|
3383 |
|
|
break;
|
3384 |
|
|
case IP6OPT_HOME_ADDRESS:
|
3385 |
|
|
haopt = (struct ip6_opt_home_address *)opt;
|
3386 |
|
|
optlen = haopt->ip6oh_len + 2;
|
3387 |
|
|
if (optlen < sizeof(*haopt)) {
|
3388 |
|
|
error = EINVAL;
|
3389 |
|
|
goto bad;
|
3390 |
|
|
}
|
3391 |
|
|
|
3392 |
|
|
/* swap */
|
3393 |
|
|
bcopy(haopt->ip6oh_addr, &t,
|
3394 |
|
|
sizeof(haopt->ip6oh_addr));
|
3395 |
|
|
bcopy(&oip6->ip6_src,
|
3396 |
|
|
haopt->ip6oh_addr,
|
3397 |
|
|
sizeof(oip6->ip6_src));
|
3398 |
|
|
bcopy(&t, &oip6->ip6_src,
|
3399 |
|
|
sizeof(t));
|
3400 |
|
|
finished = 1;
|
3401 |
|
|
break;
|
3402 |
|
|
default:
|
3403 |
|
|
optlen = ip6_unknown_opt(opt, m,
|
3404 |
|
|
opt - mtod(m, u_int8_t *));
|
3405 |
|
|
if (optlen == -1) {
|
3406 |
|
|
error = EINVAL;
|
3407 |
|
|
goto bad;
|
3408 |
|
|
}
|
3409 |
|
|
optlen += 2;
|
3410 |
|
|
break;
|
3411 |
|
|
}
|
3412 |
|
|
}
|
3413 |
|
|
break;
|
3414 |
|
|
|
3415 |
|
|
default:
|
3416 |
|
|
#ifndef PULLDOWN_TEST
|
3417 |
|
|
IP6_EXTHDR_CHECK(m, off, sizeof(struct ip6_ext),
|
3418 |
|
|
ENOBUFS);
|
3419 |
|
|
exts = (struct ip6_ext *)(mtod(m, caddr_t) + off);
|
3420 |
|
|
#else
|
3421 |
|
|
IP6_EXTHDR_GET(exts, struct ip6_ext *,
|
3422 |
|
|
m, off, sizeof(*exts));
|
3423 |
|
|
if (exts == NULL) {
|
3424 |
|
|
error = ENOBUFS;
|
3425 |
|
|
goto bad;
|
3426 |
|
|
}
|
3427 |
|
|
#endif
|
3428 |
|
|
if (nxt == IPPROTO_AH)
|
3429 |
|
|
off += (exts->ip6e_len + 2) << 2;
|
3430 |
|
|
else
|
3431 |
|
|
off += (exts->ip6e_len + 1) << 3;
|
3432 |
|
|
nxt = exts->ip6e_nxt;
|
3433 |
|
|
break;
|
3434 |
|
|
}
|
3435 |
|
|
if (finished)
|
3436 |
|
|
break;
|
3437 |
|
|
}
|
3438 |
|
|
|
3439 |
|
|
return (0);
|
3440 |
|
|
bad:
|
3441 |
|
|
ip6_delaux(m);
|
3442 |
|
|
m_freem(m);
|
3443 |
|
|
return (error);
|
3444 |
|
|
}
|
3445 |
|
|
|
3446 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
3447 |
|
|
static struct rtentry *
|
3448 |
|
|
icmp6_mtudisc_clone(dst)
|
3449 |
|
|
struct sockaddr *dst;
|
3450 |
|
|
{
|
3451 |
|
|
struct rtentry *rt;
|
3452 |
|
|
int error;
|
3453 |
|
|
|
3454 |
|
|
rt = rtalloc1(dst, 1);
|
3455 |
|
|
if (rt == 0)
|
3456 |
|
|
return NULL;
|
3457 |
|
|
|
3458 |
|
|
/* If we didn't get a host route, allocate one */
|
3459 |
|
|
if ((rt->rt_flags & RTF_HOST) == 0) {
|
3460 |
|
|
struct rtentry *nrt;
|
3461 |
|
|
|
3462 |
|
|
error = rtrequest((int) RTM_ADD, dst,
|
3463 |
|
|
(struct sockaddr *) rt->rt_gateway,
|
3464 |
|
|
(struct sockaddr *) 0,
|
3465 |
|
|
RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt);
|
3466 |
|
|
if (error) {
|
3467 |
|
|
rtfree(rt);
|
3468 |
|
|
return NULL;
|
3469 |
|
|
}
|
3470 |
|
|
nrt->rt_rmx = rt->rt_rmx;
|
3471 |
|
|
rtfree(rt);
|
3472 |
|
|
rt = nrt;
|
3473 |
|
|
}
|
3474 |
|
|
error = rt_timer_add(rt, icmp6_mtudisc_timeout,
|
3475 |
|
|
icmp6_mtudisc_timeout_q);
|
3476 |
|
|
if (error) {
|
3477 |
|
|
rtfree(rt);
|
3478 |
|
|
return NULL;
|
3479 |
|
|
}
|
3480 |
|
|
|
3481 |
|
|
return rt; /* caller need to call rtfree() */
|
3482 |
|
|
}
|
3483 |
|
|
|
3484 |
|
|
static void
|
3485 |
|
|
icmp6_mtudisc_timeout(rt, r)
|
3486 |
|
|
struct rtentry *rt;
|
3487 |
|
|
struct rttimer *r;
|
3488 |
|
|
{
|
3489 |
|
|
if (rt == NULL)
|
3490 |
|
|
panic("icmp6_mtudisc_timeout: bad route to timeout");
|
3491 |
|
|
if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) ==
|
3492 |
|
|
(RTF_DYNAMIC | RTF_HOST)) {
|
3493 |
|
|
rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt),
|
3494 |
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
|
3495 |
|
|
} else {
|
3496 |
|
|
if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0)
|
3497 |
|
|
rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
|
3498 |
|
|
}
|
3499 |
|
|
}
|
3500 |
|
|
|
3501 |
|
|
static void
|
3502 |
|
|
icmp6_redirect_timeout(rt, r)
|
3503 |
|
|
struct rtentry *rt;
|
3504 |
|
|
struct rttimer *r;
|
3505 |
|
|
{
|
3506 |
|
|
if (rt == NULL)
|
3507 |
|
|
panic("icmp6_redirect_timeout: bad route to timeout");
|
3508 |
|
|
if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) ==
|
3509 |
|
|
(RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) {
|
3510 |
|
|
rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt),
|
3511 |
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
|
3512 |
|
|
}
|
3513 |
|
|
}
|
3514 |
|
|
#endif /* __NetBSD__ || __OpenBSD__ */
|
3515 |
|
|
|
3516 |
|
|
#ifdef __bsdi__
|
3517 |
|
|
void
|
3518 |
|
|
icmp6_mtuexpire(rt, rtt)
|
3519 |
|
|
struct rtentry *rt;
|
3520 |
|
|
struct rttimer *rtt;
|
3521 |
|
|
{
|
3522 |
|
|
rt->rt_flags |= RTF_PROBEMTU;
|
3523 |
|
|
Free(rtt);
|
3524 |
|
|
}
|
3525 |
|
|
|
3526 |
|
|
int *icmp6_sysvars[] = ICMPV6CTL_VARS;
|
3527 |
|
|
|
3528 |
|
|
int
|
3529 |
|
|
icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
|
3530 |
|
|
int *name;
|
3531 |
|
|
u_int namelen;
|
3532 |
|
|
void *oldp;
|
3533 |
|
|
size_t *oldlenp;
|
3534 |
|
|
void *newp;
|
3535 |
|
|
size_t newlen;
|
3536 |
|
|
{
|
3537 |
|
|
if (name[0] >= ICMPV6CTL_MAXID)
|
3538 |
|
|
return (EOPNOTSUPP);
|
3539 |
|
|
switch (name[0]) {
|
3540 |
|
|
#if 0
|
3541 |
|
|
ICMPV6CTL_ND6_PRUNE:
|
3542 |
|
|
ICMPV6CTL_ND6_DELAY:
|
3543 |
|
|
ICMPV6CTL_ND6_UMAXTRIES:
|
3544 |
|
|
ICMPV6CTL_ND6_MMAXTRIES:
|
3545 |
|
|
ICMPV6CTL_ND6_USELOOPBACK:
|
3546 |
|
|
/* need to check the value. */
|
3547 |
|
|
#endif
|
3548 |
|
|
case ICMPV6CTL_STATS:
|
3549 |
|
|
return sysctl_rdtrunc(oldp, oldlenp, newp, &icmp6stat,
|
3550 |
|
|
sizeof(icmp6stat));
|
3551 |
|
|
case ICMPV6CTL_ND6_DRLIST:
|
3552 |
|
|
case ICMPV6CTL_ND6_PRLIST:
|
3553 |
|
|
return nd6_sysctl(name[0], oldp, oldlenp, newp, newlen);
|
3554 |
|
|
default:
|
3555 |
|
|
return (sysctl_int_arr(icmp6_sysvars, name, namelen,
|
3556 |
|
|
oldp, oldlenp, newp, newlen));
|
3557 |
|
|
}
|
3558 |
|
|
}
|
3559 |
|
|
#endif /* __bsdi__ */
|
3560 |
|
|
|
3561 |
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__)
|
3562 |
|
|
#include <vm/vm.h>
|
3563 |
|
|
#include <sys/sysctl.h>
|
3564 |
|
|
int
|
3565 |
|
|
icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
|
3566 |
|
|
int *name;
|
3567 |
|
|
u_int namelen;
|
3568 |
|
|
void *oldp;
|
3569 |
|
|
size_t *oldlenp;
|
3570 |
|
|
void *newp;
|
3571 |
|
|
size_t newlen;
|
3572 |
|
|
{
|
3573 |
|
|
|
3574 |
|
|
/* All sysctl names at this level are terminal. */
|
3575 |
|
|
if (namelen != 1)
|
3576 |
|
|
return ENOTDIR;
|
3577 |
|
|
|
3578 |
|
|
switch (name[0]) {
|
3579 |
|
|
|
3580 |
|
|
case ICMPV6CTL_REDIRACCEPT:
|
3581 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
3582 |
|
|
&icmp6_rediraccept);
|
3583 |
|
|
case ICMPV6CTL_REDIRTIMEOUT:
|
3584 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
3585 |
|
|
&icmp6_redirtimeout);
|
3586 |
|
|
case ICMPV6CTL_STATS:
|
3587 |
|
|
return sysctl_rdstruct(oldp, oldlenp, newp,
|
3588 |
|
|
&icmp6stat, sizeof(icmp6stat));
|
3589 |
|
|
case ICMPV6CTL_ND6_PRUNE:
|
3590 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune);
|
3591 |
|
|
case ICMPV6CTL_ND6_DELAY:
|
3592 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay);
|
3593 |
|
|
case ICMPV6CTL_ND6_UMAXTRIES:
|
3594 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries);
|
3595 |
|
|
case ICMPV6CTL_ND6_MMAXTRIES:
|
3596 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries);
|
3597 |
|
|
case ICMPV6CTL_ND6_USELOOPBACK:
|
3598 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
3599 |
|
|
&nd6_useloopback);
|
3600 |
|
|
case ICMPV6CTL_NODEINFO:
|
3601 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo);
|
3602 |
|
|
case ICMPV6CTL_ERRPPSLIMIT:
|
3603 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim);
|
3604 |
|
|
case ICMPV6CTL_ND6_MAXNUDHINT:
|
3605 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
3606 |
|
|
&nd6_maxnudhint);
|
3607 |
|
|
case ICMPV6CTL_MTUDISC_HIWAT:
|
3608 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
3609 |
|
|
&icmp6_mtudisc_hiwat);
|
3610 |
|
|
case ICMPV6CTL_MTUDISC_LOWAT:
|
3611 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
3612 |
|
|
&icmp6_mtudisc_lowat);
|
3613 |
|
|
case ICMPV6CTL_ND6_DEBUG:
|
3614 |
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_debug);
|
3615 |
|
|
case ICMPV6CTL_ND6_DRLIST:
|
3616 |
|
|
case ICMPV6CTL_ND6_PRLIST:
|
3617 |
|
|
return nd6_sysctl(name[0], oldp, oldlenp, newp, newlen);
|
3618 |
|
|
default:
|
3619 |
|
|
return ENOPROTOOPT;
|
3620 |
|
|
}
|
3621 |
|
|
/* NOTREACHED */
|
3622 |
|
|
}
|
3623 |
|
|
#endif /* __NetBSD__ */
|