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hardened/current/master
HardenedBSD/sys/netinet6/in6_proto.c
Shawn Webb b5ccb62107
HBSD: Resolve merge conflict 
Even though one file was conflicted, the value being hardened was moved
to a different file. So this conflict has to files modified in order to
keep the hardening in place.

Signed-off-by:	Shawn Webb <shawn.webb@hardenedbsd.org>
2024-03-25 18:43:55 +00:00

358 lines
14 KiB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $
*/
/*-
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_ipstealth.h"
#include "opt_sctp.h"
#include "opt_pax.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
#include <netinet6/raw_ip6.h>
/* netinet6/raw_ip6.c */
extern struct protosw rip6_protosw;
/* netinet6/udp6_usrreq.c */
extern struct protosw udp6_protosw, udplite6_protosw;
/* netinet/tcp_usrreq.c */
extern struct protosw tcp6_protosw;
/* netinet/sctp6_usrreq.c */
extern struct protosw sctp6_seqpacket_protosw, sctp6_stream_protosw;
/*
* TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
*/
FEATURE(inet6, "Internet Protocol version 6");
struct domain inet6domain = {
.dom_family = AF_INET6,
.dom_name = "internet6",
.dom_rtattach = in6_inithead,
#ifdef VIMAGE
.dom_rtdetach = in6_detachhead,
#endif
.dom_ifattach = in6_domifattach,
.dom_ifdetach = in6_domifdetach,
.dom_ifmtu = in6_domifmtu,
.dom_nprotosw = 14,
.dom_protosw = {
&tcp6_protosw,
&udp6_protosw,
#ifdef SCTP
&sctp6_seqpacket_protosw,
&sctp6_stream_protosw,
#else
NULL, NULL,
#endif
&udplite6_protosw,
&rip6_protosw,
/* Spacer 8 times for loadable protocols. XXXGL: why 8? */
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
},
};
DOMAIN_SET(inet6);
/*
* Internet configuration info
*/
#ifndef IPV6FORWARDING
#ifdef GATEWAY6
#define IPV6FORWARDING 1 /* forward IP6 packets not for us */
#else
#define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */
#endif /* GATEWAY6 */
#endif /* !IPV6FORWARDING */
#ifndef IPV6_SENDREDIRECTS
#ifdef PAX_HARDENING
#define IPV6_SENDREDIRECTS 0
#else
#define IPV6_SENDREDIRECTS 1
#endif
#endif
VNET_DEFINE(int, ip6_forwarding) = IPV6FORWARDING; /* act as router? */
VNET_DEFINE(int, ip6_sendredirects) = IPV6_SENDREDIRECTS;
VNET_DEFINE(int, ip6_defhlim) = IPV6_DEFHLIM;
VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS;
VNET_DEFINE(int, ip6_accept_rtadv) = 0;
VNET_DEFINE(int, ip6_no_radr) = 0;
VNET_DEFINE(int, ip6_norbit_raif) = 0;
VNET_DEFINE(int, ip6_rfc6204w3) = 0;
VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we
* process? */
VNET_DEFINE(int, ip6_dad_count) = 1; /* DupAddrDetectionTransmits */
VNET_DEFINE(int, ip6_auto_flowlabel) = 1;
#ifdef PAX_HARDENING
VNET_DEFINE(int, ip6_use_deprecated) = 0;/* allow deprecated addr
* (RFC2462 5.5.4) */
#else
VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr
* (RFC2462 5.5.4) */
#endif
VNET_DEFINE(int, ip6_rr_prune) = 5; /* router renumbering prefix
* walk list every 5 sec. */
VNET_DEFINE(int, ip6_mcast_pmtu) = 0; /* enable pMTU discovery for multicast? */
VNET_DEFINE(int, ip6_v6only) = 1;
#ifdef IPSTEALTH
VNET_DEFINE(int, ip6stealth) = 0;
#endif
VNET_DEFINE(bool, ip6_log_cannot_forward) = 1;
/*
* BSDI4 defines these variables in in_proto.c...
* XXX: what if we don't define INET? Should we define pmtu6_expire
* or so? (jinmei@kame.net 19990310)
*/
VNET_DEFINE(int, pmtu_expire) = 60*10;
VNET_DEFINE(int, pmtu_probe) = 60*2;
VNET_DEFINE_STATIC(int, ip6_log_interval) = 5;
VNET_DEFINE_STATIC(int, ip6_log_count) = 0;
VNET_DEFINE_STATIC(struct timeval, ip6_log_last) = { 0 };
#define V_ip6_log_interval VNET(ip6_log_interval)
#define V_ip6_log_count VNET(ip6_log_count)
#define V_ip6_log_last VNET(ip6_log_last)
/*
* sysctl related items.
*/
SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Internet6 Family");
/* net.inet6 */
SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"IP6");
SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"ICMP6");
SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"UDP6");
SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"TCP6");
#if defined(SCTP) || defined(SCTP_SUPPORT)
SYSCTL_NODE(_net_inet6, IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"SCTP6");
#endif
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"IPSEC6");
#endif /* IPSEC */
/* net.inet6.ip6 */
static int
sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
{
int error, val;
val = V_ip6_temp_preferred_lifetime;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error != 0 || !req->newptr)
return (error);
if (val < V_ip6_desync_factor + V_ip6_temp_regen_advance)
return (EINVAL);
V_ip6_temp_preferred_lifetime = val;
return (0);
}
static int
sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
{
int error, val;
val = V_ip6_temp_valid_lifetime;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error != 0 || !req->newptr)
return (error);
if (val < V_ip6_temp_preferred_lifetime)
return (EINVAL);
V_ip6_temp_valid_lifetime = val;
return (0);
}
int
ip6_log_ratelimit(void)
{
return (ppsratecheck(&V_ip6_log_last, &V_ip6_log_count,
V_ip6_log_interval));
}
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0,
"Enable forwarding of IPv6 packets between interfaces");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0,
"Send ICMPv6 redirects for unforwardable IPv6 packets");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0,
"Default hop limit to use for outgoing IPv6 packets");
SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat,
ip6stat,
"IP6 statistics (struct ip6stat, netinet6/ip6_var.h)");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_accept_rtadv), 0,
"Default value of per-interface flag for accepting ICMPv6 RA messages");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr,
CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_no_radr), 0,
"Default value of per-interface flag to control whether routers "
"sending ICMPv6 RA messages on that interface are added into the "
"default router list");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0,
"Always set clear the R flag in ICMPv6 NA messages when accepting RA "
"on the interface");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0,
"Accept the default router list from ICMPv6 RA messages even "
"when packet forwarding is enabled");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0,
"Frequency in seconds at which to log IPv6 forwarding errors");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0,
"Default maximum number of IPv6 extension headers permitted on "
"incoming IPv6 packets, 0 for no artificial limit");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0,
"Number of ICMPv6 NS messages sent during duplicate address detection");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0,
"Provide an IPv6 flowlabel in outbound packets");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0,
"Default hop limit for IPv6 multicast packets originating from this "
"node");
SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version,
CTLFLAG_RD, __KAME_VERSION, 0,
"KAME version string");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0,
"Allow the use of addresses whose preferred lifetimes have expired");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0,
""); /* XXX unused */
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0,
"Create RFC3041 temporary addresses for autoconfigured addresses");
SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
NULL, 0, sysctl_ip6_temppltime, "I",
"Maximum preferred lifetime for temporary addresses");
SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
NULL, 0, sysctl_ip6_tempvltime, "I",
"Maximum valid lifetime for temporary addresses");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0,
"Restrict AF_INET6 sockets to IPv6 addresses only");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_auto_linklocal), 0,
"Default value of per-interface flag for automatically adding an IPv6 "
"link-local address to interfaces when attached");
SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats,
struct rip6stat, rip6stat,
"Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0,
"Prefer RFC3041 temporary addresses in source address selection");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0,
"Use the default scope zone when none is specified");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0,
"Enable path MTU discovery for multicast packets");
#ifdef IPSTEALTH
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(ip6stealth), 0,
"Forward IPv6 packets without decrementing their TTL");
#endif
SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO,
log_cannot_forward, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(ip6_log_cannot_forward), 1,
"Log packets that cannot be forwarded");
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