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Current File : /etc/sysconfig/network-scripts/ifup-ipv6
#!/bin/sh
#
# ifup-ipv6
#
#
# Taken from:
# (P) & (C) 2000-2006 by Peter Bieringer <pb@bieringer.de>
#
#  You will find more information on the initscripts-ipv6 homepage at
#   http://www.deepspace6.net/projects/initscripts-ipv6.html
#
# RHL integration assistance by Pekka Savola <pekkas@netcore.fi>
#
# Version: 2006-07-20
#
# Note: if called (like normally) by /etc/sysconfig/network-scripts/ifup
#        exit codes aren't handled by "ifup"
#
# Uses following information from "/etc/sysconfig/network":
#  IPV6_DEFAULTDEV=<device>: controls default route (optional)
#  IPV6_DEFAULTGW=<address>: controls default route (optional)
#
# Uses following information from "/etc/sysconfig/network-scripts/ifcfg-$1":
#  IPV6INIT=yes|no: controls IPv6 configuration for this interface
#  IPV6ADDR=<IPv6 address>[/<prefix length>]: specify primary static IPv6 address
#  IPV6ADDR_SECONDARIES="<IPv6 address>[/<prefix length>] ..." (optional)
#  IPV6_ROUTER=yes|no: controls IPv6 autoconfiguration (no: multi-homed interface without routing)
#  IPV6_AUTOCONF=yes|no: controls IPv6 autoconfiguration
#   defaults:
#    IPV6FORWARDING=yes: IPV6_AUTOCONF=no, IPV6_ROUTER=yes
#    IPV6FORWARDING=no: IPV6_AUTOCONF=yes
#  IPV6_MTU=<MTU for IPv6>: controls IPv6 MTU for this link (optional)
#  IPV6_PRIVACY="rfc3041": control IPv6 privacy (optional)
#    This script only supports "rfc3041" (if kernel supports it)
#
# Optional for 6to4 tunneling (hardwired name of tunnel device is "tun6to4"):
#  IPV6TO4INIT=yes|no: controls 6to4 tunneling setup
#  IPV6TO4_RELAY=<IPv4 address>: IPv4 address of the remote 6to4 relay (default: 192.88.99.1)
#  IPV6TO4_MTU=<MTU for IPv6>: controls IPv6 MTU for the 6to4 link (optional, default is MTU of interface - 20)
#  IPV6TO4_IPV4ADDR=<IPv4 address>: overwrite local IPv4 address (optional)
#  IPV6TO4_ROUTING="<device>-<suffix>/<prefix length> ...": information to setup additional interfaces
#    Example: IPV6TO4_ROUTING="eth0-:f101::1/64 eth1-:f102::1/64"
#
# Optional for 6to4 tunneling to trigger radvd:
#  IPV6_CONTROL_RADVD=yes|no: controls radvd triggering (optional)
#  IPV6_RADVD_PIDFILE=<file>: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid" (optional)
#  IPV6_RADVD_TRIGGER_ACTION=startstop|reload|restart|SIGHUP: how to trigger radvd (optional, default is SIGHUP)
#
#  Required version of radvd to use 6to4 prefix recalculation
#   0.6.2p3 or newer supporting option "Base6to4Interface"
#  Required version of radvd to use dynamic ppp links
#   0.7.0 + fixes or newer
#


. /etc/sysconfig/network

cd /etc/sysconfig/network-scripts
. ./network-functions

CONFIG=$1
[ -f "$CONFIG" ] || CONFIG=ifcfg-$CONFIG
source_config

REALDEVICE=${DEVICE%%:*}
DEVICE=$REALDEVICE

# Test whether IPv6 configuration is disabled for this interface
is_false "$IPV6INIT" && exit 0

[ -f /etc/sysconfig/network-scripts/network-functions-ipv6 ] || exit 1
. /etc/sysconfig/network-scripts/network-functions-ipv6


# IPv6 test, module loaded, exit if system is not IPv6-ready
ipv6_test || exit 1

# Test device status
ipv6_test_device_status $DEVICE
if [ $? != 0 -a $? != 11 ]; then
    # device doesn't exist or other problem occurs
    exit 1
fi

# Setup IPv6 address on specified interface
if [ -n "$IPV6ADDR" ]; then
    ipv6_add_addr_on_device $DEVICE $IPV6ADDR || exit 1
fi

# Get current global IPv6 forwarding
ipv6_global_forwarding_current="$(/sbin/sysctl -e -n net.ipv6.conf.all.forwarding)"

# Set some proc switches depending on defines
if [ "$IPV6FORWARDING" = "yes" ]; then
    # Global forwarding should be enabled

    # Check, if global IPv6 forwarding was already set by global script
    if [ $ipv6_global_forwarding_current -ne 1 ]; then
        net_log $"Global IPv6 forwarding is enabled in configuration, but not currently enabled in kernel"
        net_log $"Please restart network with '/sbin/service network restart'"
    fi

    ipv6_local_forwarding=1
    ipv6_local_auto=0
    ipv6_local_accept_ra=0
    if [ "$IPV6_ROUTER" = "no" ]; then
        ipv6_local_forwarding=0
    fi
    if [ "$IPV6_AUTOCONF" = "yes" ]; then
        ipv6_local_auto=1
        ipv6_local_accept_ra=2
    fi
else
    # Global forwarding should be disabled

    # Check, if global IPv6 forwarding was already set by global script
    if [ $ipv6_global_forwarding_current -ne 0 ]; then
        net_log $"Global IPv6 forwarding is disabled in configuration, but not currently disabled in kernel"
        net_log $"Please restart network with '/sbin/service network restart'"
    fi

    ipv6_local_forwarding=0
    ipv6_local_auto=1
    ipv6_local_accept_ra=1
    if [ "$IPV6_AUTOCONF" = "no" ]; then
        ipv6_local_auto=0
        if [ ! "$IPV6_FORCE_ACCEPT_RA" = "yes" ]; then
            ipv6_local_accept_ra=0
        fi
    fi
fi

if [ ! "$IPV6_SET_SYSCTLS" = "no" ]; then
    /sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.forwarding=$ipv6_local_forwarding >/dev/null 2>&1
    /sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.accept_ra=$ipv6_local_accept_ra >/dev/null 2>&1
    /sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.accept_redirects=$ipv6_local_auto >/dev/null 2>&1
    /sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.autoconf=$ipv6_local_auto >/dev/null 2>&1
fi

# Set IPv6 MTU, if given
if [ -n "$IPV6_MTU" ]; then
    ipv6_set_mtu $DEVICE $IPV6_MTU
fi

# Setup additional IPv6 addresses from list, if given
if [ -n "$IPV6ADDR_SECONDARIES" ]; then
    for ipv6addr in $IPV6ADDR_SECONDARIES; do
        ipv6_add_addr_on_device $DEVICE $ipv6addr
    done
fi

# Enable IPv6 RFC3041 privacy extensions if desired
if [ "$IPV6_PRIVACY" = "rfc3041" ]; then
    if [ ! "$IPV6_SET_SYSCTLS" = "no" ]; then
        /sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.use_tempaddr=2 >/dev/null 2>&1
        if [ $? -ne 0 ]; then
            net_log $"Cannot enable IPv6 privacy method '$IPV6_PRIVACY', not supported by kernel"
        fi
    fi
fi

# Setup default IPv6 route, check are done by function
if [ -n "$IPV6_DEFAULTDEV" -o -n "$IPV6_DEFAULTGW" ]; then
    ipv6_set_default_route "$IPV6_DEFAULTGW" "$IPV6_DEFAULTDEV" "$DEVICE"
fi

# Setup additional static IPv6 routes on specified interface, if given
if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
    LC_ALL=C grep -w "^$DEVICE" /etc/sysconfig/static-routes-ipv6 | while read device args; do
        ipv6_add_route $args $DEVICE
    done
fi

# Setup of 6to4, if configured
if [ "$IPV6TO4INIT" = "yes" ]; then
    valid6to4config="yes"

    # Test device status of 6to4 tunnel
    ipv6_test_device_status tun6to4
    if [ $? = 0 ]; then
        # device is already up
        net_log $"Device 'tun6to4' (from '$DEVICE') is already up, shutdown first"
        exit 1
    fi

    # Get IPv4 address for global 6to4 prefix calculation
    if [ -n "$IPV6TO4_IPV4ADDR" ]; then
        # Take special configured from config file (precedence 1)
        ipv4addr="$IPV6TO4_IPV4ADDR"

        # Get local IPv4 address from interface
        ipv4addrlocal="$(ipv6_get_ipv4addr_of_device $DEVICE)"
        if [ -z "$ipv4addrlocal" ]; then
            # Take configured from config file
            ipv4addrlocal="$IPADDR"
        fi
    else
        # Get IPv4 address from interface first (has precedence 2)
        ipv4addr="$(ipv6_get_ipv4addr_of_device $DEVICE)"
        if [ -z "$ipv4addr" ]; then
            # Take configured from config file (precedence 3)
            ipv4addr="$IPADDR"
        fi
        ipv4addrlocal="$ipv4addr"
    fi

    if [ -n "$ipv4addr" ]; then
        if ! ipv6_test_ipv4_addr_global_usable $ipv4addr; then
            net_log $"Given IPv4 address '$ipv4addr' is not globally usable" info
            valid6to4config="no"
        fi
        if [ -z "$IPV6TO4_RELAY" ]; then
            IPV6TO4_RELAY="192.88.99.1"
        fi

        # Check/generate relay address
        ipv6to4_relay="$(ipv6_create_6to4_relay_address $IPV6TO4_RELAY)"
        if [ $? -ne 0 ]; then
            valid6to4config="no"
        fi
    else
        net_log $"IPv6to4 configuration needs an IPv4 address on related interface or otherwise specified" info
        valid6to4config="no"
    fi

    # Setup 6to4 tunnel (hardwired name is "tun6to4"), if config is valid
    if [ "$valid6to4config" = "yes" ]; then
        # Get MTU of master device
        ipv4mtu="$(/sbin/ip link show dev $DEVICE | awk '/\<mtu\>/ { print $5 }')"
        if [ -n "$ipv4mtu" ]; then
            # IPv6 tunnel MTU is IPv4 MTU minus 20 for IPv4 header
            tunnelmtu=$(($ipv4mtu-20))
        fi

        if [ -n "$IPV6TO4_MTU" ]; then
            if [ $IPV6TO4_MTU -gt $tunnelmtu ]; then
                net_log $"Warning: configured MTU '$IPV6TO4_MTU' for 6to4 exceeds maximum limit of '$tunnelmtu', ignored" warning
            else
                tunnelmtu=$IPV6TO4_MTU
            fi
        fi

        ipv6_add_6to4_tunnel tun6to4 $ipv4addr "" $tunnelmtu $ipv4addrlocal || exit 1

        # Add route to for compatible addresses (removed later again)
        ipv6_add_route "::/96" "::" tun6to4

        # Add default route, if device matches
        if [ "$IPV6_DEFAULTDEV" = "tun6to4" ]; then
            if [ -n "$IPV6_DEFAULTGW" ]; then
                net_log $"Warning: interface 'tun6to4' does not support 'IPV6_DEFAULTGW', ignored" warning
            fi
            ipv6_set_default_route $ipv6to4_relay tun6to4
        fi

        # Add static routes
        if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
            LC_ALL=C grep -w "^tun6to4" /etc/sysconfig/static-routes-ipv6 | while read device network gateway; do
                if [ -z "$network" ]; then
                    continue
                fi
                if [ -z "$gateway" ]; then
                    gateway="$ipv6to4_relay"
                fi
                ipv6_add_route $network $gateway tun6to4
            done
        fi

        # Setup additional static IPv6 routes (newer config style)
        if [ -f "/etc/sysconfig/network-scripts/route6-tun6to4" ]; then
            sed -ne 's/#.*//' -e '/[^[:space:]]/p' /etc/sysconfig/network-scripts/route6-tun6to4 | while read line; do
                if echo "$line" | LC_ALL=C grep -vq 'via'; then
                    # Add gateway if missing
                    line="$line via $ipv6to4_relay"
                fi
                /sbin/ip -6 route add $line
            done
        fi

        # Cleanup autmatically generated autotunnel (not needed for 6to4)
        /sbin/ip -6 route del ::/96 dev tun6to4
        /sbin/ip -6 addr del "::$ipv4addrlocal/128" dev tun6to4

        if [ "$IPV6_CONTROL_RADVD" = "yes" ]; then
            # RADVD is in use, so forwarding of IPv6 packets should be enabled, display warning
            if [ $ipv6_global_forwarding_current -ne 1 ]; then
                net_log $"Using 6to4 and RADVD IPv6 forwarding usually should be enabled, but it isn't" warning
            fi

            if [ -n "$IPV6TO4_ROUTING" ]; then
                ipv6to4prefix="$(ipv6_create_6to4_prefix $ipv4addr)"
                if [ -n "$ipv6to4prefix" ]; then
                    # Add route to local networks
                    for devsuf in $IPV6TO4_ROUTING; do
                        dev="${devsuf%%-*}"
                        suf="$(echo $devsuf | awk -F- '{ print $2 }')"
                        ipv6_add_addr_on_device ${dev} ${ipv6to4prefix}${suf}
                    done
                else
                    net_log $"Error occurred while calculating the IPv6to4 prefix"
                fi
            else
                net_log $"radvd control enabled, but config is not complete"
            fi

            # Control running radvd
            ipv6_trigger_radvd up "$IPV6_RADVD_TRIGGER_ACTION" $IPV6_RADVD_PIDFILE
        fi
    else
        net_log $"6to4 configuration is not valid"
        exit 1
    fi
fi

#wait for all global IPv6 addresses to leave the "tentative" state
ipv6_wait_tentative $DEVICE

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