root / kvm-vif-bridge @ ed7f0f2a
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#!/bin/bash |
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|
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# This is an example of a Ganeti kvm ifup script that configures network |
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# interfaces based on the initial deployment of the Okeanos project |
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|
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TAP_CONSTANT_MAC=cc:47:52:4e:45:54 # GRNET in hex :-) |
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MAC2EUI64=/usr/bin/mac2eui64 |
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NFDHCPD_STATE_DIR=/var/lib/nfdhcpd |
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|
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function clear_tap { |
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|
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arptables -D OUTPUT -o $INTERFACE --opcode request -j mangle >/dev/null 2>&1 |
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while ip rule del dev $INTERFACE; do :; done |
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iptables -D FORWARD -i $INTERFACE -p udp --dport 67 -j DROP 2>/dev/null |
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|
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|
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} |
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|
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function routed_setup_ipv4 { |
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# get the link's default gateway |
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gw=$GATEWAY |
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|
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# mangle ARPs to come from the gw's IP |
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arptables -A OUTPUT -o $INTERFACE --opcode request -j mangle --mangle-ip-s "$gw" |
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|
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# route interface to the proper routing table |
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ip rule add dev $INTERFACE table $TABLE |
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|
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# static route mapping IP -> INTERFACE |
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ip route replace $IP proto static dev $INTERFACE table $TABLE |
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|
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# Enable proxy ARP |
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echo 1 > /proc/sys/net/ipv4/conf/$INTERFACE/proxy_arp |
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} |
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|
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function routed_setup_ipv6 { |
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# Add a routing entry for the eui-64 |
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prefix=$SUBNET6 |
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uplink=$GATEWAY6 |
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eui64=$($MAC2EUI64 $MAC $prefix) |
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|
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while ip -6 rule del dev $INTERFACE; do :; done |
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ip -6 rule add dev $INTERFACE table $TABLE |
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ip -6 ro replace $eui64/128 dev $INTERFACE table $TABLE |
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ip -6 neigh add proxy $eui64 dev $uplink |
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|
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# disable proxy NDP since we're handling this on userspace |
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# this should be the default, but better safe than sorry |
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echo 0 > /proc/sys/net/ipv6/conf/$INTERFACE/proxy_ndp |
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} |
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|
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# pick a firewall profile per NIC, based on tags (and apply it) |
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function routed_setup_firewall { |
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ifprefix="synnefo:network:$INTERFACE_INDEX:" |
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for tag in $TAGS; do |
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case ${tag#$ifprefix} in |
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protected) |
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chain=protected |
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;; |
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unprotected) |
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chain=unprotected |
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;; |
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limited) |
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chain=limited |
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;; |
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esac |
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done |
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|
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# Flush any old rules. We have to consider all chains, since |
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# we are not sure the instance was on the same chain, or had the same |
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# tap interface. |
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for oldchain in protected unprotected limited; do |
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iptables -D FORWARD -o $INTERFACE -j $oldchain 2>/dev/null |
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ip6tables -D FORWARD -o $INTERFACE -j $oldchain 2>/dev/null |
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done |
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|
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if [ "x$chain" != "x" ]; then |
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iptables -A FORWARD -o $INTERFACE -j $chain |
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ip6tables -A FORWARD -o $INTERFACE -j $chain |
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fi |
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} |
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|
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function setup_nfdhcpd { |
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umask 022 |
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FILE=$NFDHCPD_STATE_DIR/$INTERFACE |
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cat >$FILE <<EOF |
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IFACE=$1 |
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IP=$IP |
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MAC=$MAC |
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LINK=$TABLE |
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HOSTNAME=$INSTANCE |
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TAGS="$TAGS" |
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EOF |
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if [ -n $GATEWAY ]; then |
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echo GATEWAY=$GATEWAY >> $FILE |
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fi |
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if [ -n $SUBNET ]; then |
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echo SUBNET=$SUBNET >> $FILE |
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fi |
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if [ -n $GATEWAY6 ]; then |
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echo GATEWAY6=$GATEWAY6 >> $FILE |
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fi |
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if [ -n $SUBNET6 ]; then |
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echo SUBNET6=$SUBNET6 >> $FILE |
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fi |
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|
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} |
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|
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function clear_ebtables { |
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TAP=$INTERFACE |
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FROM=FROM${TAP^^} |
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TO=TO${TAP^^} |
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|
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exist=$(ebtables -L | grep $TAP) |
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|
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if [ ! -z "$exist" ]; then |
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ebtables -D INPUT -i $TAP -j $FROM |
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ebtables -D FORWARD -i $TAP -j $FROM |
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ebtables -D FORWARD -o $TAP -j $TO |
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ebtables -D OUTPUT -o $TAP -j $TO |
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|
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ebtables -X $FROM |
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ebtables -X $TO |
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fi |
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} |
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|
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function setup_ebtables { |
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TAP=$INTERFACE |
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FROM=FROM${TAP^^} |
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TO=TO${TAP^^} |
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|
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ebtables -N $FROM |
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# do not allow changes in ip-mac pair |
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ebtables -A $FROM --ip-source \! $IP -p ipv4 -j DROP |
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ebtables -A $FROM -s \! $MAC -j DROP |
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ebtables -A FORWARD -i $TAP -j $FROM |
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ebtables -N $TO |
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ebtables -A FORWARD -o $TAP -j $TO |
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#accept dhcp responses from host (nfdhcpd) |
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ebtables -A $TO -p ipv4 --ip-protocol=udp --ip-destination-port=68 -j ACCEPT |
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if [ $TYPE == "private" ]; then |
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if [ ! -z $GATEWAY ]; then |
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# allow packets from/to router (for masquerading |
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ebtables -A $TO -s $ROUTER_MAC -j ACCEPT |
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ebtables -A INPUT -i $TAP -j $FROM |
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ebtables -A OUTPUT -o $TAP -j $TO |
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fi |
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# allow only packets from the same mac prefix |
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ebtables -A $TO -s \! $MAC/$MAC_MASK -j DROP |
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fi |
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} |
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|
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|
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TABLE=rt_$NETWORK |
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|
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source /var/lib/snf-network/networks/$NETWORK |
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|
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|
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if [ "$MODE" = "routed" ]; then |
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# special proxy-ARP/NDP routing mode |
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clear_tap |
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# use a constant predefined MAC address for the tap |
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ip link set $INTERFACE addr $TAP_CONSTANT_MAC |
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# bring the tap up |
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ifconfig $INTERFACE 0.0.0.0 up |
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|
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# Drop unicast BOOTP/DHCP packets |
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iptables -A FORWARD -i $INTERFACE -p udp --dport 67 -j DROP |
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|
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routed_setup_ipv4 |
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routed_setup_ipv6 |
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routed_setup_firewall |
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setup_nfdhcpd $INTERFACE |
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clear_ebtables >/dev/null 2>&1 |
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elif [ "$MODE" = "bridged" ]; then |
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clear_tap |
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clear_ebtables >/dev/null 2>&1 |
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ifconfig $INTERFACE 0.0.0.0 up |
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brctl addif $BRIDGE $INTERFACE |
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setup_nfdhcpd $BRIDGE |
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setup_ebtables |
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fi |