document PF_INET6 items (net.inet6.*).
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.\" $NetBSD: sysctl.3,v 1.40 1999/10/14 09:33:51 jdolecek Exp $
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.\" $NetBSD: sysctl.3,v 1.41 2000/01/01 18:00:56 itojun Exp $
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.\"
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -528,7 +528,8 @@ privilege may change the value.
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.Bl -column "Second level nameXXXXXX" "routing messagesXXX" -offset indent
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.It Sy Pa Second level name Type Changeable
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.It PF\_ROUTE routing messages no
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.It PF\_INET internet values yes
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.It PF\_INET IPv4 values yes
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.It PF\_INET6 IPv6 values yes
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.El
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.Pp
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.Bl -tag -width "123456"
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@ -550,7 +551,8 @@ The fifth and sixth level names are as follows:
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.It NET\_RT\_IFLIST None
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.El
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.It Li PF_INET
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Get or set various global information about the internet protocols.
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Get or set various global information about the IPv4
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.Pq Internet Protocol version 4 .
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The third level name is the protocol.
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The fourth level name is the variable name.
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The currently defined protocols and names are:
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@ -567,6 +569,7 @@ The currently defined protocols and names are:
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.It ip anonportmin integer yes
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.It ip anonportmax integer yes
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.It ip mtudisctimeout integer yes
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.It ip gifttl integer yes
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.It icmp maskrepl integer yes
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.It tcp rfc1323 integer yes
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.It tcp sendspace integer yes
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@ -632,6 +635,10 @@ be greater than
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Returns the number of seconds in which a route added by the Path MTU
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Discovery engine will time out. When the route times out, the Path
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MTU Discovery engine will attempt to probe a larger path MTU.
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.It Li ip.gifttl
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The maximum time-to-live (hop count) value for an IPv4 packet generated by
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.Xr gif 4
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tunnel interface.
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.It Li icmp.maskrepl
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Returns 1 if ICMP network mask requests are to be answered.
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.It Li tcp.rfc1323
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@ -724,6 +731,162 @@ Returns the default UDP receive buffer size.
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.Pp
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For variables net.*.ipsec, please refer to
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.Xr ipsec 4 .
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.It Li PF_INET6
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Get or set various global information about the IPv6
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.Pq Internet Protocol version 6 .
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The third level name is the protocol.
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The fourth level name is the variable name.
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The currently defined protocols and names are:
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.Bl -column "Protocol name" "Variable nameXX" "integer" "yes" -offset indent
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.It Pa Protocol name Variable name Type Changeable
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.It ip6 forwarding integer yes
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.It ip6 redirect integer yes
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.It ip6 hlim integer yes
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.It ip6 maxfragpackets integer yes
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.It ip6 accept_rtadv integer yes
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.It ip6 keepfaith integer yes
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.It ip6 log_interval integer yes
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.It ip6 hdrnestlimit integer yes
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.It ip6 dad_count integer yes
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.It ip6 auto_flowlabel integer yes
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.It ip6 defmcasthlim integer yes
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.It ip6 gif_hlim integer yes
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.It ip6 kame_version string no
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.It icmp6 rediraccept integer yes
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.It icmp6 redirtimeout integer yes
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.It icmp6 errratelimit integer yes
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.It icmp6 nd6_prune integer yes
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.It icmp6 nd6_delay integer yes
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.It icmp6 nd6_umaxtries integer yes
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.It icmp6 nd6_mmaxtries integer yes
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.It icmp6 nd6_useloopback integer yes
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.It icmp6 nd6_proxyall integer yes
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.It tcp6 mssdflt integer yes
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.It tcp6 do_rfc1323 integer yes
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.It tcp6 keepidle integer yes
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.It tcp6 keepinterval integer yes
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.It tcp6 keepcount integer yes
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.It tcp6 maxpersistidle integer yes
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.It tcp6 sendspace integer yes
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.It tcp6 recvspace integer yes
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.It tcp6 conntimeo integer yes
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.It tcp6 pmtu integer yes
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.It tcp6 pmtu_expire integer yes
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.It tcp6 pmtu_probe integer yes
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.It tcp6 43maxseg integer yes
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.It tcp6 syn_cache_limit integer yes
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.It tcp6 syn_bucket_limit integer yes
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.It tcp6 syn_cache_interval integer yes
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.It udp6 sendmax integer yes
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.It udp6 recvspace integer yes
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.El
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.Pp
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The variables are as follows:
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.Bl -tag -width "123456"
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.It Li ip6.forwarding
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Returns 1 when IPv6 forwarding is enabled for the node,
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meaning that the node is acting as a router.
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.It Li ip6.redirect
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Returns 1 when ICMPv6 redirects may be sent by the node.
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This option is ignored unless the node is routing IP packets,
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and should normally be enabled on all systems.
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.It Li ip6.hlim
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The default hop limit value for an IPv6 unicast packet sourced by the node.
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This value applies to all the transport protocols on top of IPv6.
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There are APIs to override the value, as documented in
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.Xr ip6 4 .
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.It Li ip6.maxfragpackets
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The maximum number of fragmented packets the node will accept.
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0 means that the node will not accept any fragmented packets.
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-1 means that the node will accept as many fragmented packets as it receives.
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The flag is provided basically for avoiding possible DoS attacks.
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.It Li ip6.accept_rtadv
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If set to non-zero, the node will accept ICMPv6 router advertisement packets
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and autoconfigures address prefixes and default routers.
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The node must be a host
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.Pq not a router
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for the option to be meaningful.
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.It Li ip6.keepfaith
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If set to non-zero, it enables
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.Dq FAITH
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TCP relay IPv6-to-IPv4 translator code in the kernel.
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Refer
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.Xr faith 4
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and
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.Xr faithd 8
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for detail.
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.It Li ip6.log_interval
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The variable controls amount of logs generated by IPv6 packet
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forwarding engine, by seting interval between log output
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.Pq in seconds .
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.It Li ip6.hdrnestlimit
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The number of IPv6 extension headers permitted on incoming IPv6 packets.
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If set to 0, the node will accept as many extension headers as possible.
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.It Li ip6.dad_count
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The variable cofigures number of IPv6 DAD
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.Pq duplicated address detection
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probe packets.
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The packets will be generated when IPv6 interface addresses are configured.
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.It Li ip6.auto_flowlabel
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On connected transport protocol packets,
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fill IPv6 flowlabel field to help intermediate routers to identify packet flows.
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.It Li ip6.defmcasthlim
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The default hop limit value for an IPv6 multicast packet sourced by the node.
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This value applies to all the transport protocols on top of IPv6.
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There are APIs to override the value, as documented in
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.Xr ip6 4 .
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.It Li ip6.gif_hlim
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The maximum hop limit value for an IPv6 packet generated by
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.Xr gif 4
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tunnel interface.
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.It Li ip6.kame_version
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The string identifies the version of KAME IPv6 stack implemented in the kernel.
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.It Li icmp6.rediraccept
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If set to non-zero, the host will accept ICMPv6 redirect packets.
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Note that IPv6 routers will never accept ICMPv6 redirect packets,
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and the variable is meaningful on IPv6 hosts
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.Pq non-router
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only.
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.It Li icmp6.redirtimeout
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The variable specifies lifetime of routing entries generated by incoming
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ICMPv6 redirect.
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.It Li icmp6.errratelimit
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The variable specifies interval between ICMPv6 error messages,
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in microseconds.
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.It Li icmp6.nd6_prune
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The variable specifies interval between IPv6 neighbor cache babysitting,
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in seconds.
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.It Li icmp6.nd6_delay
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The variable specifies
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.Dv DELAY_FIRST_PROBE_TIME
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timing constant in IPv6 neighbor discovery specification
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.Pq RFC2461 ,
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in seconds.
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.It Li icmp6.nd6_umaxtries
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The variable specifies
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.Dv MAX_UNICAST_SOLICIT
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constant in IPv6 neighbor discovery specification
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.Pq RFC2461 .
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.It Li icmp6.nd6_mmaxtries
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The variable specifies
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.Dv MAX_MULTICAST_SOLICIT
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constant in IPv6 neighbor discovery specification
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.Pq RFC2461 .
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.It Li icmp6.nd6_useloopback
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If set to non-zero, kernel IPv6 stack will use loopback interface for
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local traffic.
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.It Li icmp6.nd6_proxyall
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The variable enables proxy neighbor advertisements.
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.El
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.Pp
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Variables net.*.tcp6 and net.*.udp6 are identical to
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net.*.tcp and net.*.udp.
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Please refer to
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.Li PF_INET
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section above.
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.Xr ipsec 4 .
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For variables net.*.ipsec6, please refer to
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.Xr ipsec 4 .
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.El
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.Sh CTL_PROC
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The string and integer information available for the CTL_PROC
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@ -1010,10 +1173,12 @@ definitions for third level profiling identifiers
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.It Pa <vm/vm_param.h>
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definitions for second level virtual memory identifiers
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.It Pa <netinet/in.h>
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definitions for third level Internet identifiers and
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fourth level IP identifiers
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definitions for third level IPv4/v6 identifiers and
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fourth level IPv4/v6 identifiers
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.It Pa <netinet/icmp_var.h>
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definitions for fourth level ICMP identifiers
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.It Pa <netinet/icmp6.h>
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definitions for fourth level ICMPv6 identifiers
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.It Pa <netinet/tcp_var.h>
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definitions for fourth level TCP identifiers
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.It Pa <netinet/udp_var.h>
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