root / common.sh @ b0a87613
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#!/bin/bash |
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source /etc/default/snf-network |
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function try {
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$1 &>/dev/null || true |
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} |
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function clear_routed_setup_ipv4 {
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arptables -D OUTPUT -o $INTERFACE --opcode request -j mangle |
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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 |
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} |
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function clear_routed_setup_ipv6 {
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while ip -6 rule del dev $INTERFACE; do :; done |
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} |
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function delete_neighbor_proxy {
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if [ -z "$EUI64" -z -o "$UPLINK6" ]; then |
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return |
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fi |
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$SNF_NETWORK_LOG $0 "ip -6 neigh del proxy $EUI64 dev $UPLINK6" |
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ip -6 neigh del proxy $EUI64 dev $UPLINK6 |
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} |
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function clear_routed_setup_firewall {
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for oldchain in protected unprotected limited; do |
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iptables -D FORWARD -o $INTERFACE -j $oldchain |
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ip6tables -D FORWARD -o $INTERFACE -j $oldchain |
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done |
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} |
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function clear_ebtables {
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runlocked $RUNLOCKED_OPTS ebtables -D FORWARD -i $INTERFACE -j $FROM |
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runlocked $RUNLOCKED_OPTS ebtables -D INPUT -i $INTERFACE -j $FROM |
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runlocked $RUNLOCKED_OPTS ebtables -D FORWARD -o $INTERFACE -j $TO |
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runlocked $RUNLOCKED_OPTS ebtables -D OUTPUT -o $INTERFACE -j $TO |
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runlocked $RUNLOCKED_OPTS ebtables -X $FROM |
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runlocked $RUNLOCKED_OPTS ebtables -X $TO |
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} |
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function clear_nfdhcpd {
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rm $NFDHCPD_STATE_DIR/$INTERFACE |
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} |
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function routed_setup_ipv4 {
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if [ -z "$INTERFACE" -o -z "$NETWORK_GATEWAY" -o -z "$IP" -o -z "$TABLE" ] |
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then |
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return |
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fi |
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# mangle ARPs to come from the gw's IP |
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arptables -A OUTPUT -o $INTERFACE --opcode request -j mangle --mangle-ip-s "$NETWORK_GATEWAY" |
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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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# static route mapping IP -> INTERFACE |
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ip route replace $IP proto static dev $INTERFACE table $TABLE |
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# Enable proxy ARP |
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echo 1 > /proc/sys/net/ipv4/conf/$INTERFACE/proxy_arp |
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} |
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function send_garp {
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if [ -z "$IP" -o -z "$UPLINK" ]; then |
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return |
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fi |
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# Send GARP from host to upstream router |
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echo 1 > /proc/sys/net/ipv4/ip_nonlocal_bind |
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$SNF_NETWORK_LOG $0 "arpsend -U -i $IP -c1 $UPLINK" |
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arpsend -U -i $IP -c1 $UPLINK |
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echo 0 > /proc/sys/net/ipv4/ip_nonlocal_bind |
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} |
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function routed_setup_ipv6 {
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if [ -z "$EUI64" -o -z "$TABLE" -o -z "$INTERFACE" -o -z "$UPLINK6" ] |
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then |
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return |
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fi |
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# Add a routing entry for the eui-64 |
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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 $UPLINK6 |
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# disable proxy NDP since we're handling this on userspace |
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# this should be the default, but better safe than sorry |
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echo 0 > /proc/sys/net/ipv6/conf/$INTERFACE/proxy_ndp |
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# Send Unsolicited Neighbor Advertisement |
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$SNF_NETWORK_LOG $0 "ndsend $EUI64 $UPLINK6" |
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ndsend $EUI64 $UPLINK6 |
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} |
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# pick a firewall profile per NIC, based on tags (and apply it) |
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function routed_setup_firewall {
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# for latest ganeti there is no need to check other but uuid |
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ifprefixindex="synnefo:network:$INTERFACE_INDEX:" |
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ifprefixname="synnefo:network:$INTERFACE_NAME:" |
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ifprefixuuid="synnefo:network:$INTERFACE_UUID:" |
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for tag in $TAGS; do |
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tag=${tag#$ifprefixindex}
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tag=${tag#$ifprefixname}
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tag=${tag#$ifprefixuuid}
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case $tag in |
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protected) |
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chain=protected |
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;; |
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unprotected) |
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chain=unprotected |
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;; |
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limited) |
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chain=limited |
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;; |
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esac |
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done |
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if [ "x$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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function init_ebtables {
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runlocked $RUNLOCKED_OPTS ebtables -N $FROM -P RETURN |
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runlocked $RUNLOCKED_OPTS ebtables -A FORWARD -i $INTERFACE -j $FROM |
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# This is needed for multicast packets |
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runlocked $RUNLOCKED_OPTS ebtables -A INPUT -i $INTERFACE -j $FROM |
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runlocked $RUNLOCKED_OPTS ebtables -N $TO -P RETURN |
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runlocked $RUNLOCKED_OPTS ebtables -A FORWARD -o $INTERFACE -j $TO |
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# This is needed for multicast packets |
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runlocked $RUNLOCKED_OPTS ebtables -A OUTPUT -o $INTERFACE -j $TO |
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} |
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function setup_ebtables {
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# do not allow changes in ip-mac pair |
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if [ -n "$IP" ]; then |
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:; # runlocked $RUNLOCKED_OPTS ebtables -A $FROM --ip-source \! $IP -p ipv4 -j DROP |
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fi |
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runlocked $RUNLOCKED_OPTS ebtables -A $FROM -s \! $MAC -j DROP |
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# accept dhcp responses from host (nfdhcpd) |
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# this is actually not needed because nfdhcpd opens a socket and binds is with |
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# tap interface so dhcp response does not go through bridge |
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# INDEV_MAC=$(cat /sys/class/net/$INDEV/address) |
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# runlocked $RUNLOCKED_OPTS ebtables -A $TO -s $INDEV_MAC -p ipv4 --ip-protocol=udp --ip-destination-port=68 -j ACCEPT |
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# allow only packets from the same mac prefix |
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runlocked $RUNLOCKED_OPTS ebtables -A $TO -s \! $MAC/$MAC_MASK -j DROP |
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} |
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function setup_masq {
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# allow packets from/to router (for masquerading) |
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# runlocked $RUNLOCKED_OPTS ebtables -A $TO -s $NODE_MAC -j ACCEPT |
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# runlocked $RUNLOCKED_OPTS ebtables -A INPUT -i $INTERFACE -j $FROM |
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# runlocked $RUNLOCKED_OPTS ebtables -A OUTPUT -o $INTERFACE -j $TO |
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return |
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} |
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function setup_nfdhcpd {
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umask 022 |
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FILE=$NFDHCPD_STATE_DIR/$INTERFACE |
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#IFACE is the interface from which the packet seems to arrive |
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#needed in bridged mode where the packets seems to arrive from the |
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#bridge and not from the tap |
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cat >$FILE <<EOF |
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INDEV=$INDEV |
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IP=$IP |
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MAC=$MAC |
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HOSTNAME=$INSTANCE |
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TAGS="$TAGS" |
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GATEWAY=$NETWORK_GATEWAY |
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SUBNET=$NETWORK_SUBNET |
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GATEWAY6=$NETWORK_GATEWAY6 |
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SUBNET6=$NETWORK_SUBNET6 |
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EUI64=$EUI64 |
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EOF |
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} |
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function get_uplink {
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local table=$1 |
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UPLINK=$(ip route list table $table | grep "default via" | awk '{print $5}')
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UPLINK6=$(ip -6 route list table $table | grep "default via" | awk '{print $5}')
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$SNF_NETWORK_LOG $0 "* Table $table: uplink -> $UPLINK, uplink6 -> $UPLINK6" |
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} |
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# Because we do not have IPv6 value in our environment |
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# we caclulate it based on the NIC's MAC and the IPv6 subnet (if any) |
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# first argument MAC second IPv6 subnet |
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# Changes global value EUI64 |
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get_eui64 () {
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local mac=$1 |
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local prefix=$2 |
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if [ -z "$prefix" ]; then |
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EUI64= |
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else |
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EUI64=$($MAC2EUI64 $mac $prefix) |
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$SNF_NETWORK_LOG $0 "* $mac + $prefix -> $EUI64" |
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fi |
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} |
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# DDNS related functions |
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# ommit zone statement |
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# nsupdate will attempt determine the correct zone to update based on the rest of the input |
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send_command () {
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local command="$1" |
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$SNF_NETWORK_LOG $0 "* $command" |
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nsupdate -k $KEYFILE > /dev/null << EOF |
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server $SERVER |
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$command |
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send |
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EOF |
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} |
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update_arecord () {
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local action=$1 |
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local command= |
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if [ -n "$IP" ]; then |
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command="update $action $GANETI_INSTANCE_NAME.$FZONE $TTL A $IP" |
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send_command "$command" |
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fi |
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} |
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update_aaaarecord () {
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local action=$1 |
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local command= |
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if [ -n "$EUI64" ]; then |
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command="update $action $GANETI_INSTANCE_NAME.$FZONE $TTL AAAA $EUI64" |
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send_command "$command" |
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fi |
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} |
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update_ptrrecord () {
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local action=$1 |
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local command= |
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if [ -n "$IP" ]; then |
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command="update $action $RLPART.$RZONE. $TTL PTR $GANETI_INSTANCE_NAME.$FZONE" |
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send_command "$command" |
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fi |
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} |
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update_ptr6record () {
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local action=$1 |
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local command= |
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if [ -n "$EUI64" ]; then |
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command="update $action $R6LPART$R6ZONE. $TTL PTR $GANETI_INSTANCE_NAME.$FZONE" |
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send_command "$command" |
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fi |
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} |
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update_all () {
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local action=$1 |
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$SNF_NETWORK_LOG $0 "Update ($action) dns for $GANETI_INSTANCE_NAME $IP $EUI64" |
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update_arecord $action |
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update_aaaarecord $action |
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update_ptrrecord $action |
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update_ptr6record $action |
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} |
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# first argument is an eui64 (IPv6) |
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# sets GLOBAL args R6REC, R6ZONE, R6LPART |
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# lets assume eui64=2001:648:2ffc:1::1 |
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# the following commands produce: |
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# R6REC=1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.c.f.f.2.8.4.6.0.1.0.0.2.ip6.arpa |
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# R6ZONE=1.0.0.0.c.f.f.2.8.4.6.0.1.0.0.2.ip6.arpa |
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# R6LPART=1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0. |
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get_rev6_info () {
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local eui64=$1 |
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if [ -z "$eui64" ]; then |
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R6REC= ; R6ZONE= ; R6LPART= ; |
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else |
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R6REC=$(host $eui64 | egrep -o '([[:alnum:]]\.){32}ip6.arpa' )
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R6ZONE=$(echo $R6REC | awk -F. 'BEGIN{rpart="";} { for (i=32;i>16;i=i-1) rpart=$i "." rpart; } END{print rpart "ip6.arpa";}')
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R6LPART=$(echo $R6REC | awk -F. 'BEGIN{lpart="";} { for (i=16;i>0;i=i-1) lpart=$i "." lpart; } END{print lpart;}')
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fi |
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} |
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# first argument is an ipv4 |
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# sets args RZONE, RLPART |
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# lets assume IP=203.0.113.1 |
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# RZONE="113.0.203.in-add.arpa" |
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# RLPART="1" |
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get_rev4_info () {
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local ip=$1 |
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if [ -z "$ip" ]; then |
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RZONE= ; RLPART= ; |
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else |
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OLDIFS=$IFS |
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IFS=". " |
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set -- $ip |
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a=$1 ; b=$2; c=$3; d=$4; |
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IFS=$OLDIFS |
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RZONE="$c.$b.$a.in-addr.arpa" |
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RLPART="$d" |
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fi |
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} |
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get_ebtables_chains () {
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local iface=$1 |
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FROM=FROM${iface^^}
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TO=TO${iface^^}
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} |
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# Use environment variables to calculate desired info |
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# IP, MAC, LINK, TABLE, BRIDGE, |
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# NETWORK_SUBNET, NETWORK_GATEWAY, NETWORK_SUBNET6, NETWORK_GATEWAY6 |
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function get_info {
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$SNF_NETWORK_LOG $0 "Getting info for $INTERFACE of $GANETI_INSTANCE_NAME" |
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get_ebtables_chains $INTERFACE |
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get_rev4_info $IP |
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get_eui64 $MAC $NETWORK_SUBNET6 |
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get_rev6_info $EUI64 |
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get_uplink $TABLE |
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} |
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# Query nameserver for entries related to the specific instance |
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# An example output is the following: |
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# www.google.com has address 173.194.113.114 |
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# www.google.com has address 173.194.113.115 |
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# www.google.com has address 173.194.113.116 |
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# www.google.com has address 173.194.113.112 |
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# www.google.com has address 173.194.113.113 |
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# www.google.com has IPv6 address 2a00:1450:4001:80b::1012 |
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query_dns () {
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HOSTQ="host -s -R 3 -W 3" |
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HOST_IP_ALL=$($HOSTQ $GANETI_INSTANCE_NAME.$FZONE $SERVER | sed -n 's/.*has address //p') |
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HOST_IP6_ALL=$($HOSTQ $GANETI_INSTANCE_NAME.$FZONE $SERVER | sed -n 's/.*has IPv6 address //p') |
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} |