/*      $OpenBSD: in6_proto.c,v 1.153 2025/10/24 11:51:49 mvs Exp $     */
/*      $KAME: in6_proto.c,v 1.66 2000/10/10 15:35:47 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.
 * 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.
 *
 *      @(#)in_proto.c  8.1 (Berkeley) 6/10/93
 */

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/domain.h>

#include <net/if.h>
#include <net/if_var.h>

#include <netinet/in.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 <netinet/ip_ipsp.h>
#include <netinet/ip_ipip.h>

#include <netinet6/in6_var.h>

#include "gif.h"
#if NGIF > 0
#include <net/if_gif.h>
#endif

#include "carp.h"
#if NCARP > 0
#include <netinet/ip_carp.h>
#endif

#include "pf.h"
#if NPF > 0
#include <netinet/ip_divert.h>
#endif

#include "etherip.h"
#if NETHERIP > 0
#include <net/if_etherip.h>
#endif

#include "gre.h"
#if NGRE > 0
#include <net/if_gre.h>
#endif

/*
 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 */
u_char ip6_protox[IPPROTO_MAX];

const struct protosw inet6sw[] = {
{
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_IPV6,
  .pr_flags     = PR_MPSYSCTL,
  .pr_init      = ip6_init,
  .pr_slowtimo  = frag6_slowtimo,
  .pr_sysctl    = ip6_sysctl
},
{
  .pr_type      = SOCK_DGRAM,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_UDP,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_SPLICE|PR_MPINPUT|PR_MPSYSCTL,
  .pr_input     = udp_input,
  .pr_ctlinput  = udp6_ctlinput,
  .pr_ctloutput = ip6_ctloutput,
  .pr_usrreqs   = &udp6_usrreqs,
#ifndef SMALL_KERNEL
  .pr_sysctl    = udp_sysctl
#endif /* SMALL_KERNEL */
},
{
  .pr_type      = SOCK_STREAM,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_TCP,
  .pr_flags     = PR_CONNREQUIRED|PR_WANTRCVD|PR_ABRTACPTDIS|PR_SPLICE|
                    PR_MPINPUT|PR_MPSYSCTL,
  .pr_input     = tcp_input,
  .pr_ctlinput  = tcp6_ctlinput,
  .pr_ctloutput = tcp_ctloutput,
  .pr_usrreqs   = &tcp6_usrreqs,
#ifndef SMALL_KERNEL
  .pr_sysctl    = tcp_sysctl
#endif /* SMALL_KERNEL */
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_RAW,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPINPUT|PR_MPSYSCTL,
  .pr_input     = rip6_input,
  .pr_ctlinput  = rip6_ctlinput,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
#ifndef SMALL_KERNEL
  .pr_sysctl    = rip6_sysctl
#endif /* SMALL_KERNEL */
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_ICMPV6,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPSYSCTL,
  .pr_input     = icmp6_input,
  .pr_ctlinput  = rip6_ctlinput,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
  .pr_init      = icmp6_init,
  .pr_fasttimo  = icmp6_fasttimo,
#ifndef SMALL_KERNEL
  .pr_sysctl    = icmp6_sysctl
#endif /* SMALL_KERNEL */
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_DSTOPTS,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPINPUT,
  .pr_input     = dest6_input
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_ROUTING,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPINPUT,
  .pr_input     = route6_input
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_FRAGMENT,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPINPUT,
  .pr_input     = frag6_input
},
#ifdef IPSEC
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_AH,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPSYSCTL,
  .pr_input     = ah46_input,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
  .pr_sysctl    = ah_sysctl
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_ESP,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPSYSCTL,
  .pr_input     = esp46_input,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
  .pr_sysctl    = esp_sysctl
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_IPCOMP,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPSYSCTL,
  .pr_input     = ipcomp46_input,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
  .pr_sysctl    = ipcomp_sysctl
},
#endif /* IPSEC */
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_IPV4,
  .pr_flags     = PR_ATOMIC|PR_ADDR,
#if NGIF > 0
  .pr_input     = in6_gif_input,
#else
  .pr_input     = ipip_input,
#endif
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,        /* XXX */
},
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_IPV6,
  .pr_flags     = PR_ATOMIC|PR_ADDR,
#if NGIF > 0
  .pr_input     = in6_gif_input,
#else
  .pr_input     = ipip_input,
#endif
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,        /* XXX */
},
#if defined(MPLS) && NGIF > 0
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_MPLS,
  .pr_flags     = PR_ATOMIC|PR_ADDR,
#if NGIF > 0
  .pr_input     = in6_gif_input,
#else
  .pr_input     = ipip_input,
#endif
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,        /* XXX */
},
#endif /* MPLS */
#if NCARP > 0
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_CARP,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPSYSCTL,
  .pr_input     = carp6_proto_input,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
  .pr_sysctl    = carp_sysctl
},
#endif /* NCARP */
#if NPF > 0
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_DIVERT,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPSYSCTL,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &divert6_usrreqs,
  .pr_init      = divert6_init,
},
#endif /* NPF > 0 */
#if NETHERIP > 0
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_ETHERIP,
  .pr_flags     = PR_ATOMIC|PR_ADDR,
  .pr_input     = ip6_etherip_input,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
},
#endif /* NETHERIP */
#if NGRE > 0
{
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_protocol  = IPPROTO_GRE,
  .pr_flags     = PR_ATOMIC|PR_ADDR,
  .pr_input     = gre_input6,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
},
#endif /* NGRE */
{
  /* raw wildcard */
  .pr_type      = SOCK_RAW,
  .pr_domain    = &inet6domain,
  .pr_flags     = PR_ATOMIC|PR_ADDR|PR_MPINPUT,
  .pr_input     = rip6_input,
  .pr_ctloutput = rip6_ctloutput,
  .pr_usrreqs   = &rip6_usrreqs,
  .pr_init      = rip6_init
}
};

const struct domain inet6domain = {
  .dom_family = AF_INET6,
  .dom_name = "inet6",
  .dom_protosw = inet6sw,
  .dom_protoswNPROTOSW = &inet6sw[nitems(inet6sw)],
  .dom_sasize = sizeof(struct sockaddr_in6),
  .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr),
  .dom_maxplen = 128,
};

/*
 * Locks used to protect global variables in this file:
 *      a       atomic operations
 */

/*
 * Internet configuration info
 */
int     ip6_forwarding = 0;     /* [a] no forwarding unless sysctl to enable */
int     ip6_mforwarding = 0;    /* [a] no multicast forwarding unless ... */
int     ip6_multipath = 0;      /* [a] no using multipath routes unless ... */
int     ip6_sendredirects = 1;  /* [a] */
int     ip6_defhlim = IPV6_DEFHLIM;                     /* [a] */
int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; /* [a] */
int     ip6_maxfragpackets = 200;                       /* [a] */
int     ip6_maxfrags = 200;     /* [a] */
int     ip6_hdrnestlimit = 10;  /* [a] appropriate? */
int     ip6_dad_count = 1;      /* [a] DupAddrDetectionTransmits */
int     ip6_dad_pending;        /* number of currently running DADs */
int     ip6_mcast_pmtu = 0;     /* [a] enable pMTU discovery for multicast? */
int     ip6_neighborgcthresh = 2048; /* [a] Threshold # of NDP entries for GC */
int     ip6_maxdynroutes = 4096; /* [a] Max # of routes created via redirect */

/* 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_redirtimeout = 10 * 60;   /* 10 minutes */
int     icmp6errppslim = 100;           /* [a] 100pps */
int     ip6_mtudisc_timeout = IPMTUDISCTIMEOUT; /* [a] */