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pcg |
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#!/bin/bash |
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# Some environment variables will be set: |
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# |
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# CONFBASE=/etc/vpe # the configuration directory prefix |
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# IFNAME=vpn0 # the network interface (ifname) |
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# MAC=fe:fd:80:00:00:01 # the mac-address to use for the interface |
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# NODENAME=cerebro # the selected nodename (-n switch) |
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# NODEID=1 # the numerical node id |
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# MTU=1436 # the tunnel packet overhead (set mtu to 1500-$OVERHEAD) |
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# this if-up script is rather full-featured, and is used to |
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# generate a fully-routed (no arp traffic) vpn. the main portion |
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# consists of "ipn" calls (see below). |
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# some hosts require additional specific configuration, this is handled |
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# using if statements near the end of the script. |
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# with the --fw switch, outputs mac/net pairs for your firewall use: |
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# if-up --fw | while read mac net; do |
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# iptables -t filter -A INPUT -i vpn0 -p all -m mac --mac-source \! $mac -s $net -j DROP |
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# done |
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ipn() { |
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local id="$1"; shift |
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local mac=fe:fd:80:00:00:$(printf "%02x" $id) |
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if [ -n "$FW" ]; then |
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for net in "$@"; do |
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echo "$mac $net" |
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done |
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else |
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local ip="$1"; shift |
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if [ "$id" == $NODEID ]; then |
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[ -n "$ADDR_ONLY" ] && ip addr add $ip broadcast 10.255.255.255 dev $IFNAME |
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elif [ -z "$ADDR_ONLY" ]; then |
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ip neighbour add $ip lladdr $mac nud permanent dev $IFNAME |
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for route in "$@"; do |
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ip route add $route via $ip dev vpn0 |
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done |
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fi |
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fi |
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} |
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ipns() { |
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# this contains the generic routing information for the vpn |
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# each call to ipn has the following parameters: |
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# ipn <node-id> <gateway-ip> [<route> ...] |
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# the second line (ipn 2) means: |
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# the second node (doom in the config file) has the ip address 10.0.0.5, |
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# which is the gateway for the 10.0/28 network and three additional ip |
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# addresses |
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ipn 1 10.0.0.20 |
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ipn 2 10.0.0.5 10.0.0.0/28 200.100.162.92 200.100.162.93 100.99.218.222 |
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ipn 3 10.0.0.17 |
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ipn 4 10.0.0.18 |
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ipn 5 10.0.0.19 |
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ipn 6 10.0.0.21 10.0.2.0/26 200.100.162.17 |
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ipn 7 10.0.0.22 10.1.2.0/24 |
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ipn 8 10.0.0.23 |
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ipn 9 10.0.0.24 10.13.0.0/16 |
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ipn 10 10.0.0.25 |
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ipn 11 10.0.0.26 |
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ipn 12 10.0.0.27 10.0.2.64/26 |
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ipn 13 10.0.0.28 10.0.3.0/24 |
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ipn 14 10.0.0.29 10.1.1.0/24 |
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# mind the gateway ip gap |
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ipn 15 10.9.0.30 10.0.4.0/24 |
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ipn 16 10.9.0.31 |
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} |
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if [ "$1" == "--fw" ]; then |
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FW=1 |
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ipns |
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else |
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exec >/var/log/vpe.if-up 2>&1 |
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set -x |
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[ $NODENAME = "ruth" ] && ip link set $IFNAME down # hack |
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# first set the link up and initialize the interface ip |
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# address. |
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ip link set $IFNAME address $MAC mtu $MTU up |
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ADDR_ONLY=1 ipns # set addr only |
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# now initialize the main vpn routes (10.0/8) |
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# the second route is a hack to to reach some funnily-connected |
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# machines. |
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ip route add 10.0.0.0/8 dev $IFNAME |
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ip route add 10.0.0.0/27 dev $IFNAME |
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ipns # set the interface routes |
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# now for something completely different, ehr, something not |
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# easily doable with ipn, namely some extra specific highly complicated |
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# and non-regular setups for some machines. |
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if [ $NODENAME = doom ]; then |
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ip addr add 200.100.162.92 dev $IFNAME |
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ip route add 200.100.0.0/16 via 10.0.0.17 dev $IFNAME |
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ip route flush table 101 |
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ip route add table 101 default src 200.100.162.92 via 10.0.0.17 dev $IFNAME |
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ip addr add 100.99.218.222 dev $IFNAME |
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ip route add 100.99.218.192/27 via 10.0.0.19 dev $IFNAME |
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ip route flush table 103 |
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ip route add table 103 default src 100.99.218.222 via 10.0.0.19 |
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elif [ $NODENAME = marco ]; then |
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ip addr add 200.100.162.17 dev $IFNAME |
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ip route add 200.100.162.79 dev ppp0 |
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ip route add 200.100.162.95 dev ppp0 |
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ip route add 200.100.76.0/23 dev ppp0 |
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ip route add src 200.100.162.17 200.100.0.0/16 via 10.0.0.17 dev $IFNAME |
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fi |
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# and this is the second part of the 10.0/27 hack. don't ask. |
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[ $NODENAME != fwkw ] && ip route add 10.0.0.0/24 via 10.0.0.29 dev $IFNAME |
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fi |
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