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freebsd/sys/netinet6/in6_proto.c
Gleb Smirnoff a97719482d Add CARP (Common Address Redundancy Protocol), which allows multiple 
hosts to share an IP address, providing high availability and load
balancing.

Original work on CARP done by Michael Shalayeff, with many
additions by Marco Pfatschbacher and Ryan McBride.

FreeBSD port done solely by Max Laier.

Patch by:	mlaier
Obtained from:	OpenBSD (mickey, mcbride)
2005-02-22 13:04:05 +00:00

473 lines
15 KiB
C
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/* $FreeBSD$ */
/* $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $ */
/*-
* 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.
*/
/*-
* 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.
* 4. 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.
*
* @(#)in_proto.c 8.1 (Berkeley) 6/10/93
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_carp.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/radix.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet/tcp.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet6/tcp6_var.h>
#include <netinet6/raw_ip6.h>
#include <netinet6/udp6_var.h>
#include <netinet6/pim6_var.h>
#include <netinet6/nd6.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#ifdef INET6
#include <netinet6/ipsec6.h>
#endif
#include <netinet6/ah.h>
#ifdef INET6
#include <netinet6/ah6.h>
#endif
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#ifdef INET6
#include <netinet6/esp6.h>
#endif
#endif
#include <netinet6/ipcomp.h>
#ifdef INET6
#include <netinet6/ipcomp6.h>
#endif
#endif /* IPSEC */
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#ifdef FAST_IPSEC
#include <netipsec/ipsec6.h>
#define IPSEC
#define IPSEC_ESP
#define ah6_input ipsec6_common_input
#define esp6_input ipsec6_common_input
#define ipcomp6_input ipsec6_common_input
#endif /* FAST_IPSEC */
#include <netinet6/ip6protosw.h>
#include <net/net_osdep.h>
/*
* TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
*/
extern struct domain inet6domain;
static struct pr_usrreqs nousrreqs;
#define PR_LISTEN 0
#define PR_ABRTACPTDIS 0
struct ip6protosw inet6sw[] = {
{ 0, &inet6domain, IPPROTO_IPV6, 0,
0, 0, 0, 0,
0,
ip6_init, 0, frag6_slowtimo, frag6_drain,
&nousrreqs,
},
{ SOCK_DGRAM, &inet6domain, IPPROTO_UDP, PR_ATOMIC|PR_ADDR,
udp6_input, 0, udp6_ctlinput, ip6_ctloutput,
0,
0, 0, 0, 0,
&udp6_usrreqs,
},
{ SOCK_STREAM, &inet6domain, IPPROTO_TCP, PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN,
tcp6_input, 0, tcp6_ctlinput, tcp_ctloutput,
0,
#ifdef INET /* don't call initialization and timeout routines twice */
0, 0, 0, tcp_drain,
#else
tcp_init, tcp_fasttimo, tcp_slowtimo, tcp_drain,
#endif
&tcp6_usrreqs,
},
{ SOCK_RAW, &inet6domain, IPPROTO_RAW, PR_ATOMIC|PR_ADDR,
rip6_input, rip6_output, rip6_ctlinput, rip6_ctloutput,
0,
0, 0, 0, 0,
&rip6_usrreqs
},
{ SOCK_RAW, &inet6domain, IPPROTO_ICMPV6, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
icmp6_input, rip6_output, rip6_ctlinput, rip6_ctloutput,
0,
icmp6_init, icmp6_fasttimo, 0, 0,
&rip6_usrreqs
},
{ SOCK_RAW, &inet6domain, IPPROTO_DSTOPTS,PR_ATOMIC|PR_ADDR,
dest6_input, 0, 0, 0,
0,
0, 0, 0, 0,
&nousrreqs
},
{ SOCK_RAW, &inet6domain, IPPROTO_ROUTING,PR_ATOMIC|PR_ADDR,
route6_input, 0, 0, 0,
0,
0, 0, 0, 0,
&nousrreqs
},
{ SOCK_RAW, &inet6domain, IPPROTO_FRAGMENT,PR_ATOMIC|PR_ADDR,
frag6_input, 0, 0, 0,
0,
0, 0, 0, 0,
&nousrreqs
},
#ifdef IPSEC
{ SOCK_RAW, &inet6domain, IPPROTO_AH, PR_ATOMIC|PR_ADDR,
ah6_input, 0, 0, 0,
0,
0, 0, 0, 0,
&nousrreqs,
},
#ifdef IPSEC_ESP
{ SOCK_RAW, &inet6domain, IPPROTO_ESP, PR_ATOMIC|PR_ADDR,
esp6_input, 0,
esp6_ctlinput,
0,
0,
0, 0, 0, 0,
&nousrreqs,
},
#endif
{ SOCK_RAW, &inet6domain, IPPROTO_IPCOMP, PR_ATOMIC|PR_ADDR,
ipcomp6_input, 0, 0, 0,
0,
0, 0, 0, 0,
&nousrreqs,
},
#endif /* IPSEC */
#ifdef INET
{ SOCK_RAW, &inet6domain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
encap6_input, rip6_output, 0, rip6_ctloutput,
0,
encap_init, 0, 0, 0,
&rip6_usrreqs
},
#endif /* INET */
{ SOCK_RAW, &inet6domain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
encap6_input, rip6_output, 0, rip6_ctloutput,
0,
encap_init, 0, 0, 0,
&rip6_usrreqs
},
{ SOCK_RAW, &inet6domain, IPPROTO_PIM, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
pim6_input, rip6_output, 0, rip6_ctloutput,
0,
0, 0, 0, 0,
&rip6_usrreqs
},
#ifdef DEV_CARP
{ SOCK_RAW, &inet6domain, IPPROTO_CARP, PR_ATOMIC|PR_ADDR,
carp6_input, rip6_output, 0, rip6_ctloutput,
0,
0, 0, 0, 0,
&rip6_usrreqs
},
#endif /* DEV_CARP */
/* raw wildcard */
{ SOCK_RAW, &inet6domain, 0, PR_ATOMIC|PR_ADDR,
rip6_input, rip6_output, 0, rip6_ctloutput,
0,
0, 0, 0, 0,
&rip6_usrreqs
},
};
extern int in6_inithead __P((void **, int));
struct domain inet6domain =
{ AF_INET6, "internet6", 0, 0, 0,
(struct protosw *)inet6sw,
(struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])], 0,
in6_inithead,
offsetof(struct sockaddr_in6, sin6_addr) << 3,
sizeof(struct sockaddr_in6),
in6_domifattach, in6_domifdetach, };
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
#define IPV6_SENDREDIRECTS 1
#endif
int ip6_forwarding = IPV6FORWARDING; /* act as router? */
int ip6_sendredirects = IPV6_SENDREDIRECTS;
int ip6_defhlim = IPV6_DEFHLIM;
int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
int ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */
int ip6_maxfragpackets; /* initialized in frag6.c:frag6_init() */
int ip6_maxfrags; /* initialized in frag6.c:frag6_init() */
int ip6_log_interval = 5;
int ip6_hdrnestlimit = 50; /* appropriate? */
int ip6_dad_count = 1; /* DupAddrDetectionTransmits */
int ip6_auto_flowlabel = 1;
int ip6_gif_hlim = 0;
int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
int ip6_rr_prune = 5; /* router renumbering prefix
* walk list every 5 sec. */
int ip6_v6only = 1;
int ip6_keepfaith = 0;
time_t ip6_log_time = (time_t)0L;
/* icmp6 */
/*
* 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)
*/
int pmtu_expire = 60*10;
int pmtu_probe = 60*2;
/* raw IP6 parameters */
/*
* Nominal space allocated to a raw ip socket.
*/
#define RIPV6SNDQ 8192
#define RIPV6RCVQ 8192
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 = 3; /* enable/disable NI response */
/* UDP on IP6 parameters */
int udp6_sendspace = 9216; /* really max datagram size */
int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
/* 40 1K datagrams */
/*
* sysctl related items.
*/
SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW, 0,
"Internet6 Family");
/* net.inet6 */
SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW, 0, "IP6");
SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW, 0, "ICMP6");
SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW, 0, "UDP6");
SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW, 0, "TCP6");
#ifdef IPSEC
SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW, 0, "IPSEC6");
#endif /* IPSEC */
/* net.inet6.ip6 */
static int
sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
{
int error = 0;
int old;
error = SYSCTL_OUT(req, arg1, sizeof(int));
if (error || !req->newptr)
return (error);
old = ip6_temp_preferred_lifetime;
error = SYSCTL_IN(req, arg1, sizeof(int));
if (ip6_temp_preferred_lifetime <
ip6_desync_factor + ip6_temp_regen_advance) {
ip6_temp_preferred_lifetime = old;
return (EINVAL);
}
return (error);
}
static int
sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
{
int error = 0;
int old;
error = SYSCTL_OUT(req, arg1, sizeof(int));
if (error || !req->newptr)
return (error);
old = ip6_temp_valid_lifetime;
error = SYSCTL_IN(req, arg1, sizeof(int));
if (ip6_temp_valid_lifetime < ip6_temp_preferred_lifetime) {
ip6_temp_preferred_lifetime = old;
return (EINVAL);
}
return (error);
}
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING,
forwarding, CTLFLAG_RW, &ip6_forwarding, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS,
redirect, CTLFLAG_RW, &ip6_sendredirects, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
hlim, CTLFLAG_RW, &ip6_defhlim, 0, "");
SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_STATS, stats, CTLFLAG_RD,
&ip6stat, ip6stat, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS,
maxfragpackets, CTLFLAG_RW, &ip6_maxfragpackets, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
accept_rtadv, CTLFLAG_RW, &ip6_accept_rtadv, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_KEEPFAITH,
keepfaith, CTLFLAG_RW, &ip6_keepfaith, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
log_interval, CTLFLAG_RW, &ip6_log_interval, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT,
hdrnestlimit, CTLFLAG_RW, &ip6_hdrnestlimit, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT,
dad_count, CTLFLAG_RW, &ip6_dad_count, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL,
auto_flowlabel, CTLFLAG_RW, &ip6_auto_flowlabel, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM,
defmcasthlim, CTLFLAG_RW, &ip6_defmcasthlim, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM,
gifhlim, CTLFLAG_RW, &ip6_gif_hlim, 0, "");
SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
kame_version, CTLFLAG_RD, __KAME_VERSION, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED,
use_deprecated, CTLFLAG_RW, &ip6_use_deprecated, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
rr_prune, CTLFLAG_RW, &ip6_rr_prune, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR,
use_tempaddr, CTLFLAG_RW, &ip6_use_tempaddr, 0, "");
SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_preferred_lifetime, 0,
sysctl_ip6_temppltime, "I", "");
SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_valid_lifetime, 0,
sysctl_ip6_tempvltime, "I", "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY,
v6only, CTLFLAG_RW, &ip6_v6only, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL,
auto_linklocal, CTLFLAG_RW, &ip6_auto_linklocal, 0, "");
SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD,
&rip6stat, rip6stat, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR,
prefer_tempaddr, CTLFLAG_RW, &ip6_prefer_tempaddr, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGS,
maxfrags, CTLFLAG_RW, &ip6_maxfrags, 0, "");
/* net.inet6.icmp6 */
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT,
rediraccept, CTLFLAG_RW, &icmp6_rediraccept, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT,
redirtimeout, CTLFLAG_RW, &icmp6_redirtimeout, 0, "");
SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD,
&icmp6stat, icmp6stat, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE,
nd6_prune, CTLFLAG_RW, &nd6_prune, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY,
nd6_delay, CTLFLAG_RW, &nd6_delay, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES,
nd6_umaxtries, CTLFLAG_RW, &nd6_umaxtries, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES,
nd6_mmaxtries, CTLFLAG_RW, &nd6_mmaxtries, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK,
nd6_useloopback, CTLFLAG_RW, &nd6_useloopback, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
nodeinfo, CTLFLAG_RW, &icmp6_nodeinfo, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT,
errppslimit, CTLFLAG_RW, &icmp6errppslim, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT,
nd6_maxnudhint, CTLFLAG_RW, &nd6_maxnudhint, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG,
nd6_debug, CTLFLAG_RW, &nd6_debug, 0, "");
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