577 lines
16 KiB
C
577 lines
16 KiB
C
/* $NetBSD: in6_proto.c,v 1.128 2020/06/12 11:04:45 roy Exp $ */
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/* $KAME: in6_proto.c,v 1.66 2000/10/10 15:35:47 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 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. 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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* @(#)in_proto.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: in6_proto.c,v 1.128 2020/06/12 11:04:45 roy Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_gateway.h"
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#include "opt_inet.h"
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#include "opt_ipsec.h"
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#include "opt_dccp.h"
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#include "opt_sctp.h"
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#include "opt_net_mpsafe.h"
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#endif
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/kernel.h>
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#include <sys/domain.h>
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#include <sys/mbuf.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcp_debug.h>
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#include <netinet6/udp6.h>
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#include <netinet6/udp6_var.h>
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#ifdef DCCP
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#include <netinet/dccp.h>
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#include <netinet/dccp_var.h>
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#include <netinet6/dccp6_var.h>
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#endif
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#ifdef SCTP
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#include <netinet/sctp_pcb.h>
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#include <netinet/sctp.h>
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#include <netinet/sctp_var.h>
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#include <netinet6/sctp6_var.h>
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#endif
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#include <netinet6/pim6_var.h>
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#ifdef IPSEC
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#include <netipsec/ipsec.h>
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#include <netipsec/ipsec6.h>
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#include <netipsec/key.h>
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#endif
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#include "carp.h"
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#if NCARP > 0
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#include <netinet/ip_carp.h>
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#endif
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#include <netinet6/ip6protosw.h>
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/*
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* TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
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*/
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DOMAIN_DEFINE(inet6domain); /* forward declare and add to link set */
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/* Wrappers to acquire kernel_lock. */
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PR_WRAP_CTLINPUT(rip6_ctlinput)
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PR_WRAP_CTLINPUT(encap6_ctlinput)
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PR_WRAP_CTLINPUT(udp6_ctlinput)
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PR_WRAP_CTLINPUT(tcp6_ctlinput)
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#define rip6_ctlinput rip6_ctlinput_wrapper
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#define encap6_ctlinput encap6_ctlinput_wrapper
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#define udp6_ctlinput udp6_ctlinput_wrapper
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#define tcp6_ctlinput tcp6_ctlinput_wrapper
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PR_WRAP_CTLOUTPUT(rip6_ctloutput)
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PR_WRAP_CTLOUTPUT(tcp_ctloutput)
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PR_WRAP_CTLOUTPUT(udp6_ctloutput)
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PR_WRAP_CTLOUTPUT(icmp6_ctloutput)
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#define rip6_ctloutput rip6_ctloutput_wrapper
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#define tcp_ctloutput tcp_ctloutput_wrapper
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#define udp6_ctloutput udp6_ctloutput_wrapper
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#define icmp6_ctloutput icmp6_ctloutput_wrapper
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#if defined(DCCP)
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PR_WRAP_CTLINPUT(dccp6_ctlinput)
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PR_WRAP_CTLOUTPUT(dccp_ctloutput)
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#define dccp6_ctlinput dccp6_ctlinput_wrapper
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#define dccp_ctloutput dccp_ctloutput_wrapper
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#endif
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#if defined(SCTP)
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PR_WRAP_CTLINPUT(sctp6_ctlinput)
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PR_WRAP_CTLOUTPUT(sctp_ctloutput)
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#define sctp6_ctlinput sctp6_ctlinput_wrapper
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#define sctp_ctloutput sctp_ctloutput_wrapper
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#endif
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#ifdef NET_MPSAFE
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PR_WRAP_INPUT6(udp6_input)
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PR_WRAP_INPUT6(tcp6_input)
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#ifdef DCCP
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PR_WRAP_INPUT6(dccp6_input)
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#endif
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#ifdef SCTP
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PR_WRAP_INPUT6(sctp6_input)
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#endif
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PR_WRAP_INPUT6(rip6_input)
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PR_WRAP_INPUT6(dest6_input)
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PR_WRAP_INPUT6(route6_input)
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PR_WRAP_INPUT6(frag6_input)
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#if NPFSYNC > 0
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PR_WRAP_INPUT6(pfsync_input)
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#endif
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PR_WRAP_INPUT6(pim6_input)
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#define udp6_input udp6_input_wrapper
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#define tcp6_input tcp6_input_wrapper
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#define dccp6_input dccp6_input_wrapper
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#define sctp6_input sctp6_input_wrapper
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#define rip6_input rip6_input_wrapper
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#define dest6_input dest6_input_wrapper
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#define route6_input route6_input_wrapper
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#define frag6_input frag6_input_wrapper
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#define pim6_input pim6_input_wrapper
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#endif
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#if defined(IPSEC)
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#ifdef IPSEC_RUMPKERNEL
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/*
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* .pr_input = ipsec6_common_input won't be resolved on loading
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* the ipsec shared library. We need a wrapper anyway.
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*/
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static int
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ipsec6_common_input_wrapper(struct mbuf **mp, int *offp, int proto)
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{
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if (ipsec_enabled) {
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return ipsec6_common_input(mp, offp, proto);
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} else {
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m_freem(*mp);
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return IPPROTO_DONE;
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}
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}
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#define ipsec6_common_input ipsec6_common_input_wrapper
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/* The ctlinput functions may not be loaded */
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#define IPSEC_WRAP_CTLINPUT(name) \
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static void * \
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name##_wrapper(int a, const struct sockaddr *b, void *c)\
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{ \
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void *rv; \
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KERNEL_LOCK(1, NULL); \
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if (ipsec_enabled) \
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rv = name(a, b, c); \
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else \
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rv = NULL; \
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KERNEL_UNLOCK_ONE(NULL); \
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return rv; \
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}
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IPSEC_WRAP_CTLINPUT(ah6_ctlinput)
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IPSEC_WRAP_CTLINPUT(esp6_ctlinput)
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#else /* !IPSEC_RUMPKERNEL */
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PR_WRAP_CTLINPUT(ah6_ctlinput)
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PR_WRAP_CTLINPUT(esp6_ctlinput)
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#endif /* !IPSEC_RUMPKERNEL */
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#define ah6_ctlinput ah6_ctlinput_wrapper
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#define esp6_ctlinput esp6_ctlinput_wrapper
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#endif /* IPSEC */
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static void
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tcp6_init(void)
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{
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icmp6_mtudisc_callback_register(tcp6_mtudisc_callback);
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tcp_init_common(sizeof(struct ip6_hdr));
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}
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const struct ip6protosw inet6sw[] = {
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{ .pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_IPV6,
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.pr_init = ip6_init,
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.pr_fasttimo = frag6_fasttimo,
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.pr_slowtimo = frag6_slowtimo,
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.pr_drain = frag6_drainstub,
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},
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_ICMPV6,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = icmp6_input,
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.pr_ctlinput = rip6_ctlinput,
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.pr_ctloutput = icmp6_ctloutput,
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.pr_usrreqs = &rip6_usrreqs,
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.pr_init = icmp6_init,
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},
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{ .pr_type = SOCK_DGRAM,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_UDP,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
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.pr_input = udp6_input,
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.pr_ctlinput = udp6_ctlinput,
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.pr_ctloutput = udp6_ctloutput,
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.pr_usrreqs = &udp6_usrreqs,
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.pr_init = udp6_init,
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},
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{ .pr_type = SOCK_STREAM,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_TCP,
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.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF,
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.pr_input = tcp6_input,
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.pr_ctlinput = tcp6_ctlinput,
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.pr_ctloutput = tcp_ctloutput,
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.pr_usrreqs = &tcp_usrreqs,
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.pr_init = tcp6_init,
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.pr_fasttimo = tcp_fasttimo,
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.pr_drain = tcp_drainstub,
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},
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#ifdef DCCP
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{ .pr_type = SOCK_CONN_DGRAM,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_DCCP,
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.pr_flags = PR_CONNREQUIRED|PR_ATOMIC|PR_LISTEN,
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.pr_input = dccp6_input,
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.pr_ctlinput = dccp6_ctlinput,
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.pr_ctloutput = dccp_ctloutput,
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.pr_usrreqs = &dccp6_usrreqs,
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#ifndef INET
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.pr_init = dccp_init,
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#endif
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},
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#endif /* DCCP */
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#ifdef SCTP
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{ .pr_type = SOCK_DGRAM,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_SCTP,
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.pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
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.pr_input = sctp6_input,
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.pr_ctlinput = sctp6_ctlinput,
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.pr_ctloutput = sctp_ctloutput,
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.pr_usrreqs = &sctp6_usrreqs,
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.pr_drain = sctp_drain,
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},
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{ .pr_type = SOCK_SEQPACKET,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_SCTP,
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.pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
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.pr_input = sctp6_input,
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.pr_ctlinput = sctp6_ctlinput,
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.pr_ctloutput = sctp_ctloutput,
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.pr_usrreqs = &sctp6_usrreqs,
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.pr_drain = sctp_drain,
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},
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{ .pr_type = SOCK_STREAM,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_SCTP,
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.pr_flags = PR_CONNREQUIRED|PR_ADDR_OPT|PR_WANTRCVD|PR_LISTEN,
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.pr_input = sctp6_input,
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.pr_ctlinput = sctp6_ctlinput,
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.pr_ctloutput = sctp_ctloutput,
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.pr_usrreqs = &sctp6_usrreqs,
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.pr_drain = sctp_drain,
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},
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#endif /* SCTP */
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_RAW,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
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.pr_input = rip6_input,
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.pr_ctlinput = rip6_ctlinput,
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.pr_ctloutput = rip6_ctloutput,
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.pr_usrreqs = &rip6_usrreqs,
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},
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#ifdef GATEWAY
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{ .pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_IPV6,
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.pr_slowtimo = ip6flow_slowtimo,
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.pr_init = ip6flow_poolinit,
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},
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#endif /* GATEWAY */
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_DSTOPTS,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = dest6_input,
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},
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_ROUTING,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = route6_input,
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},
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_FRAGMENT,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = frag6_input,
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},
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#ifdef IPSEC
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_AH,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = ipsec6_common_input,
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.pr_ctlinput = ah6_ctlinput,
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},
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_ESP,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = ipsec6_common_input,
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.pr_ctlinput = esp6_ctlinput,
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},
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_IPCOMP,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = ipsec6_common_input,
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},
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#endif /* IPSEC */
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#ifdef INET
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_IPV4,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap6_input,
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.pr_ctlinput = encap6_ctlinput,
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.pr_ctloutput = rip6_ctloutput,
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.pr_usrreqs = &rip6_usrreqs,
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.pr_init = encap_init,
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},
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#endif
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_IPV6,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap6_input,
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.pr_ctlinput = encap6_ctlinput,
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.pr_ctloutput = rip6_ctloutput,
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.pr_usrreqs = &rip6_usrreqs,
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.pr_init = encap_init,
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},
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#if NCARP > 0
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_CARP,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = carp6_proto_input,
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.pr_ctloutput = rip6_ctloutput,
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.pr_usrreqs = &rip6_usrreqs,
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},
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#endif /* NCARP */
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_L2TP,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap6_input,
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.pr_ctlinput = rip6_ctlinput,
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.pr_ctloutput = rip6_ctloutput,
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.pr_usrreqs = &rip6_usrreqs,
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.pr_init = encap_init,
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},
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{ .pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = IPPROTO_PIM,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = pim6_input,
|
|
.pr_ctloutput = rip6_ctloutput,
|
|
.pr_usrreqs = &rip6_usrreqs,
|
|
.pr_init = pim6_init,
|
|
},
|
|
/* raw wildcard */
|
|
{ .pr_type = SOCK_RAW,
|
|
.pr_domain = &inet6domain,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
|
|
.pr_input = rip6_input,
|
|
.pr_ctloutput = rip6_ctloutput,
|
|
.pr_usrreqs = &rip6_usrreqs,
|
|
.pr_init = rip6_init,
|
|
},
|
|
};
|
|
|
|
static const struct sockaddr_in6 in6_any = {
|
|
.sin6_len = sizeof(in6_any)
|
|
, .sin6_family = AF_INET6
|
|
, .sin6_port = 0
|
|
, .sin6_flowinfo = 0
|
|
, .sin6_addr = IN6ADDR_ANY_INIT
|
|
, .sin6_scope_id = 0
|
|
};
|
|
|
|
bool in6_present = false;
|
|
static void
|
|
in6_dom_init(void)
|
|
{
|
|
|
|
in6_present = true;
|
|
}
|
|
|
|
struct domain inet6domain = {
|
|
.dom_family = AF_INET6, .dom_name = "internet6",
|
|
.dom_init = in6_dom_init, .dom_externalize = NULL, .dom_dispose = NULL,
|
|
.dom_protosw = (const struct protosw *)inet6sw,
|
|
.dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])],
|
|
.dom_rtattach = rt_inithead,
|
|
.dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3,
|
|
.dom_maxrtkey = sizeof(struct ip_pack6),
|
|
.dom_if_up = in6_if_up, .dom_if_down = in6_if_down,
|
|
.dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach,
|
|
.dom_if_link_state_change = in6_if_link_state_change,
|
|
.dom_ifqueues = { NULL, NULL },
|
|
.dom_link = { NULL },
|
|
.dom_mowner = MOWNER_INIT("",""),
|
|
.dom_sa_cmpofs = offsetof(struct sockaddr_in6, sin6_addr),
|
|
.dom_sa_cmplen = sizeof(struct in6_addr),
|
|
.dom_sa_any = (const struct sockaddr *)&in6_any,
|
|
.dom_sockaddr_externalize = sockaddr_in6_externalize,
|
|
};
|
|
|
|
#if 0
|
|
int
|
|
sockaddr_in6_cmp(const struct sockaddr *lsa, const struct sockaddr *rsa)
|
|
{
|
|
uint_fast8_t len;
|
|
const uint_fast8_t addrofs = offsetof(struct sockaddr_in6, sin6_addr),
|
|
addrend = addrofs + sizeof(struct in6_addr);
|
|
int rc;
|
|
const struct sockaddr_in6 *lsin6, *rsin6;
|
|
|
|
lsin6 = satocsin6(lsa);
|
|
rsin6 = satocsin6(rsa);
|
|
|
|
len = MIN(addrend, MIN(lsin6->sin6_len, rsin6->sin6_len));
|
|
|
|
if (len > addrofs &&
|
|
(rc = memcmp(&lsin6->sin6_addr, &rsin6->sin6_addr,
|
|
len - addrofs)) != 0)
|
|
return rc;
|
|
|
|
return lsin6->sin6_len - rsin6->sin6_len;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Internet configuration info
|
|
*/
|
|
#ifdef GATEWAY6
|
|
#define IPV6FORWARDING 1 /* forward IP6 packets not for us */
|
|
#else
|
|
#define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */
|
|
#endif
|
|
|
|
int ip6_forwarding = IPV6FORWARDING; /* act as router? */
|
|
int ip6_sendredirects = 1;
|
|
int ip6_defhlim = IPV6_DEFHLIM;
|
|
int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
|
|
int ip6_maxfragpackets = 200;
|
|
int ip6_maxfrags = 200;
|
|
int ip6_log_interval = 5;
|
|
int ip6_hdrnestlimit = 15;
|
|
int ip6_dad_count = 1; /* DupAddrDetectionTransmits */
|
|
int ip6_auto_flowlabel = 1;
|
|
int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
|
|
int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */
|
|
int ip6_v6only = 1;
|
|
int ip6_neighborgcthresh = 2048; /* Threshold # of NDP entries for GC */
|
|
int ip6_maxdynroutes = 4096; /* Max # of routes created via redirect */
|
|
|
|
int ip6_keepfaith = 0;
|
|
time_t ip6_log_time = 0;
|
|
|
|
/* icmp6 */
|
|
int pmtu_expire = 60*10;
|
|
|
|
/* raw IP6 parameters */
|
|
/*
|
|
* Nominal space allocated to a raw ip socket.
|
|
*/
|
|
#define RIPV6SNDQ 8192
|
|
#define RIPV6RCVQ 16384
|
|
|
|
u_long rip6_sendspace = RIPV6SNDQ;
|
|
u_long rip6_recvspace = RIPV6RCVQ;
|
|
|
|
/* ICMPV6 parameters */
|
|
int icmp6_rediraccept = 1; /* accept and process redirects */
|
|
int icmp6_redirtimeout = 10 * 60; /* 10 minutes */
|
|
int icmp6errppslim = 100; /* 100pps */
|
|
int icmp6_nodeinfo = 1; /* enable/disable NI response */
|