194 lines
6.3 KiB
Bash
194 lines
6.3 KiB
Bash
#!/bin/sh
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#
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# ip-up.ipv6to4
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#
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#
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# Taken from:
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# (P) & (C) 2000-2005 by Peter Bieringer <pb@bieringer.de>
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#
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# You will find more information on the initscripts-ipv6 homepage at
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# http://www.deepspace6.net/projects/initscripts-ipv6.html
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#
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# Version: 2005-09-22
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#
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# Calling parameters:
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# $1: interface name
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#
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# Called (mostly) by /etc/ppp/ip-up.local
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# like: /etc/ppp/ip-up.ipv6to4 $1 >>/var/log/ppp-ipv6to4.log 2>&1
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#
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# Note: this script will *kill* older still existing 6to4 tunnels regardless
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# whether they were set before by another device
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#
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# Uses following information from /etc/sysconfig/network-scripts/ifcfg-$1:
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# IPV6TO4INIT=yes|no: controls configuration
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# IPV6TO4_IPV4ADDR=<IPv4 address>: special local address for 6to4 tunneling (only needed behind a NAT gateway)
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# IPV6TO4_RELAY=<IPv4 address>: remote 6to4 relay router address (default: 192.88.99.1)
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# IPV6TO4_MTU=<MTU for IPv6>: controls IPv6 MTU for the 6to4 link (optional, default is MTU of interface - 20)
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# IPV6TO4_ROUTING="<device>-<suffix>/<prefix length> ...": information to setup additional interfaces
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# Example: IPV6TO4_ROUTING="eth0-:f101::1/64 eth1-:f102::1/64"
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#
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# IPV6_CONTROL_RADVD=yes|no: controls radvd triggering
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# IPV6_RADVD_PIDFILE=<file>: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid"
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# IPV6_RADVD_TRIGGER_ACTION=startstop|reload|restart|SIGHUP: how to trigger radvd (optional, default is SIGHUP)
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#
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# Requirements
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# radvd-0.6.2p3 or newer supporting option "Base6to4Interface"
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#
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if [ -z "$1" ]; then
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echo $"Argument 1 is empty but should contain interface name - skip IPv6to4 initialization"
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exit 1
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fi
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# Get global network configuration
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. /etc/sysconfig/network
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# Source IPv4 helper functions
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cd /etc/sysconfig/network-scripts
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. ./network-functions
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CONFIG=$1
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[ -f "$CONFIG" ] || CONFIG=ifcfg-$CONFIG
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source_config
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# IPv6 don't need aliases anymore, config is skipped
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REALDEVICE=${DEVICE%%:*}
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[ "$DEVICE" != "$REALDEVICE" ] && exit 0
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if [ ! -f /etc/sysconfig/network-scripts/network-functions-ipv6 ]; then
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exit 1
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fi
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. /etc/sysconfig/network-scripts/network-functions-ipv6
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# Run basic IPv6 test (and make sure the ipv6 module will be loaded), if not ok, skip IPv6 initialization
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ipv6_test || exit 1
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# Setup of 6to4, if configured
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valid6to4config="yes"
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if [ "$IPV6TO4INIT" = "yes" ]; then
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if [ -n "$IPV6TO4_IPV4ADDR" ]; then
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# Take 6to4-dedicated configured IPv4 address from config file (precedence 1)
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ipv4addr="$IPV6TO4_IPV4ADDR"
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else
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# Get IPv4 address from interface (precedence 2)
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ipv4addr="$(ipv6_get_ipv4addr_of_device $DEVICE)"
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if [ -z "$ipv4addr" ]; then
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# Take configured IPv4 address of interface from config file (precedence 3)
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ipv4addr="$IPADDR"
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fi
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fi
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if [ -n "$ipv4addr" ]; then
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# Test for non-global IPv4 address
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if ! ipv6_test_ipv4_addr_global_usable $ipv4addr; then
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net_log $"Given IPv4 address '$ipv4addr' is not globally usable" info
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valid6to4config="no"
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fi
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else
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net_log $"IPv6to4 configuration needs an IPv4 address on related interface or otherwise specified" info
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valid6to4config="no"
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fi
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if [ -z "$IPV6TO4_RELAY" ]; then
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IPV6TO4_RELAY="192.88.99.1"
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fi
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# Check/generate relay address
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ipv6to4_relay="$(ipv6_create_6to4_relay_address $IPV6TO4_RELAY)"
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if [ $? -ne 0 ]; then
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valid6to4config="no"
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fi
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if [ "$valid6to4config" = "yes" ]; then
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# Delete routes to local networks
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for devsuf in $IPV6TO4_ROUTING; do
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dev="${devsuf%%-*}"
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ipv6_cleanup_6to4_device $dev
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done
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# Cleanup all old data (needed, if "ip-down.ipv6to4" wasn't executed), delete all configured 6to4 address
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ipv6_cleanup_6to4_tunnels tun6to4
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# Get MTU of master device
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ipv4mtu="$(/sbin/ip link show dev $DEVICE | awk '/\<mtu\>/ { print $5 }')"
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if [ -n "$ipv4mtu" ]; then
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# IPv6 tunnel MTU is IPv4 MTU minus 20 for IPv4 header
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tunnelmtu=$[ $ipv4mtu - 20 ]
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fi
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if [ -n "$IPV6TO4_MTU" ]; then
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if [ $IPV6TO4_MTU -gt $tunnelmtu ]; then
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net_log $"Warning: configured MTU '$IPV6TO4_MTU' for 6to4 exceeds maximum limit of '$tunnelmtu', ignored" warning
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else
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tunnelmtu=$IPV6TO4_MTU
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fi
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fi
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# Setup new data
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ipv6_add_6to4_tunnel tun6to4 $ipv4addr "" $tunnelmtu || exit 1
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# Add route to for compatible addresses (removed later again)
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ipv6_add_route "::/96" "::" tun6to4
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# Add default route, if device matches
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if [ "$IPV6_DEFAULTDEV" = "tun6to4" ]; then
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if [ -n "$IPV6_DEFAULTGW" ]; then
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net_log $"Warning: interface 'tun6to4' does not support 'IPV6_DEFAULTGW', ignored" warning
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fi
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ipv6_set_default_route $ipv6to4_relay tun6to4
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fi
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# Add static routes
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if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
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LC_ALL=C grep -w "^tun6to4" /etc/sysconfig/static-routes-ipv6 | while read device network gateway; do
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if [ -z "$network" ]; then
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continue
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fi
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if [ -z "$gateway" ]; then
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gateway="$ipv6to4_relay"
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fi
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ipv6_add_route $network $gateway tun6to4
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done
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fi
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# Setup additional static IPv6 routes (newer config style)
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if [ -f "/etc/sysconfig/network-scripts/route6-tun6to4" ]; then
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sed -ne 's/#.*//' -e '/[^[:space:]]/p' /etc/sysconfig/network-scripts/route6-tun6to4 | while read line; do
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if echo "$line" | grep -vq 'via'; then
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# Add gateway if missing
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line="$line via $ipv6to4_relay"
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fi
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/sbin/ip -6 route add $line
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done
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fi
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# Cleanup autmatically generated autotunnel (not needed for 6to4)
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/sbin/ip -6 route del ::/96 dev tun6to4
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/sbin/ip -6 addr del tun6to4 "::$ipv4addr/128" dev tun6to4
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if [ "$IPV6_CONTROL_RADVD" = "yes" ]; then
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# Control running radvd
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ipv6_trigger_radvd up "$IPV6_RADVD_TRIGGER_ACTION" $IPV6_RADVD_PIDFILE
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if [ -n "$IPV6TO4_ROUTING" ]; then
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# Generate 6to4 address
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ipv6to4prefix="$(ipv6_create_6to4_prefix $ipv4addr)"
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if [ -n "$ipv6to4prefix" ]; then
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# Add IPv6 address to interface (required interface route will be set automatically)
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for devsuf in $IPV6TO4_ROUTING; do
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dev="${devsuf%%-*}"
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suf="$(echo $devsuf | awk -F- '{ print $2 }')"
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ipv6_add_addr_on_device ${dev} ${ipv6to4prefix}${suf}
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done
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else
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net_log $"Error occurred while calculating the IPv6to4 prefix"
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fi
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else
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net_log $"radvd control enabled, but config is not complete"
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fi
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fi
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fi
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fi
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